Hemmi Slide Rule Catalogue Raisonné
This Catalogue Raisonne describes every slide rule ever made by the Hemmi Slide Rule Company of Japan--or at least all those I have been able to identify.  It is the most comprehensive catalogue of Hemmi slide rules ever published.  There are two parts: (1) THIS PAGE lists Hemmi slide rules for which a model number is known.
(2) The SECOND PAGE (click here) contains descriptions of Hemmi-made slide rules for which I have not been able to determine a model number.  These are usually rules with names rather than numbers or military rules or rules sold under another company's (Post, Foxboro, SKF, etc.) name.
Construction material is celluloid on bamboo except for model number which begin with "P" (e.g., "P23") which are all plastic and for a few rules whose substance is explicitly mentioned in the text.
This is an updated version of the Comprehensive Hemmi Catalog which was published in the Spring 2003 issue of the Journal of the Oughtred Society.  It is based upon about 500 documents, photographs and specimen slide rules, many of which were supplied by my friends in Japan: William Lise, Atsushi Tomozawa, Yukio Kubota and Hitoshi Nori; I cannot begin to express my gratitude to them. Many errors exist in spite of their efforts and this catalog remains a work in progress.  I will be grateful to anyone who can supply missing information or pictures or point out errors.   I am indebted to Tom Dilatush for prolonged discussions of how this information should be organized and displayed.
Paul Ross
Model	Dates		Front Scales	Rear and Other Calculating  Scales	Body	Comment	Also Sold As
Models1-18: Obsolete model numbers abandoned about 1930.
1 1/1	1913-29	Pic	A [B, C] D	[S, L, T] (S keyed to A/B)	//Closed|| 250 x 28   x 9.5mm	Mannheim. ("Normal")  Listed as Obsolete starting in 1936 but price listed through 1937 and available from Frederick Post (1449) through 1940.	Tamaya 1941 (1916-27); H-O 1768 (-1914-); Post 1449 (1930-WWII)
		Pic				Artillery variant with minutes and mils conversion scales on bottom edge and trigonometric formulas for gunnery on back of rule.  Dates probably later than model 1.
		Pic	A [B, Stadia, C] D			Stadia variant.  Stadia scale (SinCos and Cos²) added to front of slide.  Dates probably later than model 1.
2	1913-29	Pic	Same as model 1 but with decimal-indicating cursor.			Discontinued ca1929.	Tamaya 1937 (1913-27);  H-O 1767 (-1914-28-)
3	1919-29	Pic	LL2, A [B, C] D, LL3	[S, L, T] (S keyed to A/B) Gutter: E, F	//Closed|| 250 mm   x 1-1/4in   x 10 mm	Electro. (Copy of Faber 378)  LL scales keyed to offset W gauge mark.  E,F scales separated in gutter.  No over-range.  HP gauge mark (probably only 746). Single hairline.  At least three different cursors.  Tamaya 1905 (1919-27); H-O 1770 (1928),  Hemmi 80 (1930+).
4	1919-29	Pic	Same as 3 but with decimal-indicating cursor.			Tamaya 1904 (1916-27), Hemmi 81 (1930+).
5	1919-29	Pic	A [B, C] D	[S, L, T] (S keyed to A/B)	//Closed|| 500 mm   x 1-1/4   x13/32in	Listed as obsolete by Hemmi in 1936 but price listed through 1937. In Post catalog (1450) until WWII and in H-O catalog (1772) though1948.	Tamaya 1899 (1916-27); H-O 1772 (1928); Post 1450 (1936-WWII).
6	1919-29	Pic	A [B, C]  D	[S, L, T] (S keyed to A/B)	//Closed|| 125 x 24   x 9 mm	Pocket Mannheim.   Replaced by model 48 ca1930.	H-O 1763 (-1914-35); Tamaya 1942 (1916-27).
7	1926-29	Pic	Same as 6 but with decimal-indicating cursor				Tamaya 1949 (1927)
8	1913-29	Pic	A [B, C]  D	[S, L, T] (S keyed to A/B)	//Closed|| 125 x 24   x 9 mm	Extra Fine Mannheim w Magnifier.	Tamaya 1943 (1916-27); H-O 1764 (-1914-48-)
9	1919-29	Pic	Same as 8 but with magnifiying decimal-indicating cursor			Discontinued ca1929.	Tamaya 1900 (1916-27)
10	1926-29	Pic	A [B, C] D	[S, L, T] (S keyed to A/B)	//Closed|| 250 mm	Ten-inch extra fine with "extended lens" magnifier.  Discontinued ca1929.	Tamaya 2148 (1927)
11	1926-29	Pic	Same as10 but with decimal-indicating "extended-lens" cursor.			Discontinued ca1930.	Tamaya 2180 (1927)
12			DF [CF, CI, C]  D               (Folded at ?)	Blank	? 150 mm	Simplified Slide Rule.  Plastic.  Single uncorroborated reference.
12	1926-29	Pic	Same as model 3 but with "extended-lens" magnifying cursor.			Discontinued ca1929.	Tamaya 2782 (1927)
13	1926-29	Pic	Same as 4 but with decimal-indicating "extended-lens" cursor.			Discontinued ca1929.	Tamaya 2783 (1927)
14	1926-29	Pic	A [B, C] D	[S, L, T] (S keyed to A/B)	||Closed|| 100 mm   x 11/16  x 7/32 in	Vest Pocket Mannheim with square edges.	Tamaya 2784 (1927); Hemmi 35 (1930+)
15	1926-29	Pic	Same as 14 but with decimal-indicating cursor.			Discontinued ca1929.	Tamaya 2785 (1927)
16	1926-29	Pic	Same as 14 but with magnifying cursor.			Discontinued ca1929.	Tamaya 2786.  Hemmi 35ML (1930+)
17	1926-29	Pic	Same as 14 but with magnifying decimal-indicating cursor.			Discontinued ca1929.	Tamaya 2787
18	1926-29		Pocket kit including pen, pad and model 15 slide rule.			Discontinued ca1929.	Tamaya 2788
19	1927	Pic	A [B, C] D	[S, L, T] ?	250 mm	Student version of model 1.  Model number may have been changed to 40 before any were actually sold.
Model Numbers 20-24 were assigned to Classroom Demo Rules before WWII; Student Rules after WWII.
20	1932-42		A [B, CI, C] D, K	[S, L, T] (S keyed to A/B)	Demo 2000 mm	Demonstration Mannheim (Model 50).	Tamaya 4451 (1932)
21	1932-42		K, A [B, CI, C] D, L              with over-range	[S, S&T, T]	Demo 2000 mm	Demonstration Rietz (Model 64).	Tamaya 4452 (1932)
22	1951-59	Pic	[CI, C] D, A	No back	Special 200 x 23   x 9 mm	Cheap student rule distributed in Asia only.  Slide held to single stator.  Some (1955 only?) sandalwood, not bamboo.  Celluloid cursor.
P23	1957-69	Pic	A [B, CI, C] D	Blank	Open 180 mm   x1 x1/8in	Student Mannheim w CI scale. "First plastic-based rule."
P24	1963-69	Pic	DF [CF, CI, C]  D, A Folded at √10.	Blank	Open 180 mm x1 x1/8in	Student.
24	1927	Pic	A [B, C] D	Blank	//Closed|| 125 x 26   x 3 mm	Ultra-thin all plastic with celluloid cursor.  13 cm scale on top edge; bottom blank.  Identical to model 34 except imprinted with advertising.  Rare.  Appears in no known catalog.
Models 30-39: Miscellaneous four- and five-inch closed body rules
30	1930-43	Pic	A [B, C] D	[S, L, T] (S keyed to A/B)	//Closed|| 100 mm   x 11/16   x 7/32 in	Vest Pocket Mannheim.  Model number never appears on rule.  Some w "SUN" cut through or "SKF" embossed into backing plate.   1000¥ ($2.78) in 1969.	Tamaya 4453 (1927); Post 1447 (1931-33); Post 1440 (1934-WWII)
31	1930-42	Pic	Same as 30 but with decimal-indicating cursor.			No CI scale.	Tamaya 4454
32	1930-42	Pic	Same as 30 but with magnifying cursor.			Tamaya 4455;  Post 1447M (1931-33); 1441 (1934-WWII); Boston Blue Print 1441; US Blue 1888
33	1930-42	Pic	Same as 30 but with decimal-indicating magnifying cursor			No CI scale.	Tamaya 4456
30R	MIOJ	Pic	A [B, CI, C] D	[S, L, T] (S keyed to A/B except WWII-1955 keyed to C/D)	//Closed|| 100 mm   x 11/16   x 7/32 in	Vest Pocket Mannheim w CI scale.   No model number on rule but case and box marked "30R."	Fuji 41.
30	1951-EOB	Pic				Same rule with "R" dropped from model number on case and box.  All-plastic cursor after ca 1970.
32R	MIOJ	Pic	A [B, CI, C] D	[S, L, T] (S keyed to A/B except WWII-1955 keyed to C/D)	//Closed|| 100 mm   x 11/16   x 7/32 in	Same body as 30R except with magnifier.  No model number on rule but case and box marked "32R."	Post 1441(WWII-1971); T-P 44DA-410 (1972+); H-O 1760 (-1952-64); Geo 341-3405 (1964+) US Blue 1888 (MIOJ)
32	MIOJ-EOB	Pic				Same rule with "R" dropped from model number on case and box.  All-plastic cursor after ca 1970.
P33S	1971	Pic	A [B, CI, C] D, K	[S, L, T] (S keyed to C/D)	Closed 125 x 28   x 5 mm	Pocket Improved Mannheim.  All-plastic version of model 34RK.
P33 /SS	1970	Pic	A [B, CI, C] D, K	[S, L, T] (S keyed to C/D)	Closed 125 x 27   x 4.5mm	Pocket Improved Mannheim.  Unique size.
34	1932	Pic	A [B, C] D	Blank	//Closed|| 125 x 26   x 3 mm	Ultra-thin all plastic with celluloid cursor.  13 cm scale on top edge; bottom blank.	Hemmi 24; Tamaya 4457
34P	1932-42		A [B, C] D	Blank	//Closed|| 125mm   x 15/16   x 5/32in	Thin Pocket Mannheim with blank back	Post 1443 (1931-WWII)
	MIOJ	Pic			//Closed|| 125 x 26   x 5 mm
34π	1932-MIOJ		CF [DF, CI, C]  D	[S, L, T] (S keyed to C/D)	//Closed|| 125mm   x 15/16   x 5/32 in	Thin Pocket Mannheim with folded scales	Post 1445 (1931-WWII)
	MIOJ	Pic			//Closed|| 125 x 26   x 5 mm
34R	1935-40	Pic	A [B, CI, C] D	[S, L, T] (S keyed to A/B except WWII-1955 keyed to C/D)	//Closed|| 125mm   x 15/16   x 1/8 in	Thin Pocket Mannheim w CI Scale.	Post 1444 (c1935-WWII); H-O 1762 (-1935-WWII)
	1955-68	Pic			//Closed|| 125 x 26   x 5 mm
34RK	1936-EOB	Pic	A [B, CI, C] D, K	[S, L, T] (S keyed to A/B except WWII-1955 keyed to C/D)	//Closed|| 125 x 26   x 5 mm	Post 1444K (1937-70),1444(1971); T-P 44DA-440 (1972+); US Blue 1887 (1930s); H-O 1762 (WWII-64); Geo 341-3425 (1964+).
34T	1936-42	Pic	A [B, C] D	[S, L, T] (S keyed to A/B)	//Closed|| 125 mm   x 15/16   x 1/8 in	Thin Pocket Mannheim.  "SUN" or ASEA embossed into backing plate.
35	1935-48	Pic	A [B, C] D	[S, L, T] (S keyed to A/B)	||Closed|| 100 mm   x 11/16   x 3/16 in	Vest Pocket Mannheim with  4-inch and 10-cm measuring scales on square edges	Hemmi 14; Post 1437 (c1935-WWII); H-O 1761 (-1935-48-)
35ML	1930s	Pic	Same as 35 but with magnifying cursor				Hemmi 16
P35 B35	1959-61	Pic	K, DF [CF, CI, C] D, A Folded at √10.	Blank	Open 115 mm   x 1 x 1/8in	Thin bamboo core (in spite of "P" prefix) coverd with PVC (not celluloid).  Marks printed, not engraved as usual with celluloid over bamboo rules.	H-O 1759. (Some with Hemmi factory model error "B35")
P35S	1971	Pic	K, DF [CF, CI, C] D, A Folded at √10.	[LL1, LL2, LL3]	Closed 125 x 28   x 4.6mm
36	1936-WWII	Pic	A [B, CI, C] D	[S, L, T] (S keyed to A/B)	Closed 125 mm   x 3/4       x 7/32 in	Narrow Pocket Mannheim w CI scale. Measuring scales on BACK of rule.	Post 1438 (c1935-WWII)
P36 P36S	1966-70	Pic	D [Conversion gauge marks, A] D	Instructions [Conversion gauge marks, B] Instructions	Open 115 mm   x 1         x 1/8in	Rule is labeled "P36;" box and instructions "P36S."  Set arrow on slide opposite value on top D scale; converted value appears on bottom D scale opposite corresponding arrow.  Reverse slide for more conversions.  Markings and instructions in Japanese.     450¥ ($1.25) in 1969.
P37	1966-70	Pic	(1), (2), D [C, CI, B] MD1, MD2	[B, PR1, PR2, PR3]	Closed 125 x 28   x 4.6mm	SALES.  Labeled in Japanese.  MD1 is months and days from 1/1 to 6/30, MD2 from 7/1 to 12/31.  PR1-2-3 = three short profit ratio scales.  Reverse slide to read B, PR scales.. {Two hairlines: D: 1.2}. 700¥ ($1.94) 1969
P39			K, A, DF [CF, CIF, CI, C] D, DI, L               (Folded at ?)	[B, TI, SI, C]	Closed 125 mm	Single uncorroborated reference.
Models 40-49: Basic Mannheim Rules (A [B, C] D) before WWI and "Improved" Mannheim (A [B, CI, C]  D, K) after WWII.
40	1932-49	Pic	A [B, C] D	[S, L, T] (S keyed to A/B)	Closed 250 x 28   x 8 mm	Tamaya 4458 (1927), Post 1446 (1931-49); H-O 1768 (-1935-48-); Boston Blue Print 1446; US Blue 1876 (1930s); Lietz 2974N (1930s).
41	1932-42	Pic	A [B, C] D	[S, L, T] (S keyed to A/B)	Closed 125 mm	Pocket Mannheim.   No measuring scales	Tamaya 4459 (1932)
42	1932	Pic	A [B, C] D	[S, L, T] (S keyed to A/B)	Closed 250 x 28   x 8 mm	Model 40 w measuring scales on BACK.	Tamaya 4460 (1932)
43	1932		Same as 42 but with decimal-indicating cursor.				Tamaya 4461 (1932)
44	1932	Pic	A [B, C] D	[S, L, T] (S keyed to A/B)	Closed 125 mm   x 15/16   x 1/4in	No slant; cm & inch scales on back of rule.	Tamaya 4462 (1932)
45	1932		Same as 44 but with decimal-indicating cursor.				Tamaya 4463 (1932)
45	1949-68	Pic	DF [CF, CI, C] D, A Folded at √10.	[TI, L, SI]	Closed 200 x 28   x 8 mm	Student.  Quite different from 1932 model 45.
46	1936-42	Pic	A [B, C] D	Blank	Special 125mm    x 1 in	"Cardboard covered in transparent celluloid with leather sheath."
47	1936-42	Pic	A [B, C] D	[S, L, T] (S keyed to A/B)	//Closed|| 250x28      x 8 mm	Thin successor to model 1/1.	Post 1449T (1937-WWII)
48	1932-42	Pic	A [B, C] D	[S, L, T] (S keyed to A/B)	//Closed|| 125 mm   x 15/16   x 1/4 in	Pocket Mannheim.   Thin successor to model 6.
40F	1968-69	Pic	K, DF [CF, CI, C] D, A      Folded at √10.	[TI, L, SI]	Closed 250 x 28   x 8 mm		Fuji 85.
40RK	1949-69	Pic	A [B, CI, C] D, K	[S, L, T] (S keyed to A/B except Staedtler 944-55 keyed to C/D)	Closed 250 x 28   x 8 mm	Improved Mannheim.  ("Slide Rule with CI and K Scale" in early literature)	Post 1447 (c1949-1971); H-O 1768C (-1952-64); Geo 341-3526 (1964-71); US Blue 1877 (1940s?).
	1972	Pic	Same as preceding but wider with thick plastic back		Closed 250 mm   x 1-1/4   x 9/32 in		T-P 44BA-470 (1972+); H-O 341-3526 (1972+)
P 40RK	1967-69	Pic	A [B, CI, C] D, K	[S, L, T] (S keyed to A/B)	Open 250 x 28   x 8 mm	All-Plastic Improved Mannheim.  Hard plastic case.	Post 1447P  (c1967); Geo 341-3530 (c1967)
43A	1961-71	Pic	A [B, CI, C] D, K	[T, L, S] (S keyed to C/D)	Closed 200 x 28   x 8 mm	Student Improved Mannheim.
P43D	1973-EOB	Pic	A [B, CI, C] D, K	[T, L, S] (S keyed to C/D)	Closed 200 x 28 x 6.4mm	Like 43S except no indices on back of rule; slide must be reversed.
P43S	1969	Pic	A [B, CI, C] D, K	[T, L, S] (S keyed to C/D)	Closed 200 x 28   x 6.4mm	Plastic version of 43A.  Indices for reading trig scales on back of rule.
45K	1962-EOB	Pic	K, DF [CF, CI, C] D, A Folded at √10.	[TI, L, SI]	Closed 200 x 28   x 8 mm	Post 1445 (c1966-71);   T-P 44BA-450 (1972+);   Geo 341-3500 (1967+).      All have scales folded at π.
P45K	1965-69	Pic	K, DF [CF, CI, C] D, A Folded at √10.	[TI, L, SI]	Open 200 x 28   x 5 mm	Open body all-plastic version of 45K	Post 1445P (-1965-) has scales folded at π.
P45D	1973-EOB	Pic	K, DF [CF, CI, C] D, A      Folded at √10.	[T, L, S]	Closed 200 x 28   x 6.4mm	"Junior High School Students."  Like P45S except trig scales not inverted and no indices on back of rule; slide must be reversed.
P45S	1969-73	Pic	K, DF [CF, CI, C] D, A Folded at √10.	[TI, L, SI]	Closed 200 x 28   x 6.4mm	Closed body all-plastic version of 45K.  Simpler construction than P45K.
Models 50-59: "Improved" Mannheims (A [B, CI, C] D, K and [S, L, T])  and variants
50 50/1 50/3	1932-51	Pic	A [B, CI, C] D, K	[S, L, T] (S keyed to A/B except WWII-1955 keyed to C/D)	//Closed|| 250 x 28   x10.5mm	Improved Mannheim.  Formerly model 102.	Hemmi 102; Tamaya 4464 (1932); Post 1452 (c1935-51); H-O 1771 (-1928-48-); US Blue 1880 (1930s)
50F, 50/1F	1936-MIOJ	Pic	A [B, CI, C] D, K	[S, L, T] (S keyed to A/B)	//Closed|| 250 x 28   x 8 mm	Thin version of 50, 50/1 but accepts standard cursor.	Post 1452T (1936-WWII)
50/1π	1936-42	Pic	A, DF [CF, CI, C] D, L Folded at π.	[S, S&T, T]	//Closed|| 250 x 28   x10.5mm		Post 1455 (c1935-WWII)
50W	1951-EOB (For Post)	Pic	A [B, CI, C] D, K	[S, L, T] (S keyed to A/B except WWII-1955 keyed to C/D)	//Closed|| 250 x 34   x 11 mm	Wide Improved Mannheim.	Post 1452W ('51-70),  1452 ('71);  T-P 44BA-520 ('72+); H-O 1771 ('51-64);  Geo 341-3215 ('64+)
P50	1965?-68?		A [B, CI, C] D, K	Blank	Open? 250 mm   x 1-1/2 in	Improved Mannheim
50-20	1935-48	Pic	A [B, CI, C] D, K	[S, L, T] (S keyed to A/B)	//Closed|| 500 x 34   x 11 mm	Long Improved Mannheim.   Made for Post & H-O only; not sold as Hemmi  brand.	Post 1454 (-1936-WWII); H-O 1772 (-1935-58-) H-O 341-3235 (-1969-)
	WWII-1969	Pic			//Closed|| 500 x 40   x 12 mm	Wide Long Improved Mannheim.  Hemmi & Post brands.  {Three Hairlines: D: C, C}.
51/1, 51/3	1932-42	Pic	Same as 50/1, 50/3 but with decimal-indicating cursor.		//Closed|| 250 x 28   x10.5mm	Formerly model 103.	Tamaya 4466, 4467 (1932)
52	1932-42	Pic	A [B, CI, C] D	[S, L, T] (S keyed to A/B)	//Closed|| 125 mm   x 15/16   x 11/32in	Thicker than 34R	Tamaya 4468; Post 1448 (1936-37)
53	1932-42	Pic	Same as 52 but with decimal-indicating cursor.				Tamaya 4469 (1932)
54	1936-42	Pic	A [B, CI, C] D, K                  with over-range	[S, L, T] (S keyed to A/B)	//Closed|| 150 x 26   x 6  mm	Extra Fine Improved Mannheim with magnifying cursor.	Post 1453 (c1935-WWII)
55	1936-42		Same as 54 but without magnifying cursor
Models 60-79: Rietz Rules ( K, A [B, C] D, L and [S, S&T, T] )
60/1, 60/3	1932-3x	Pic	K, A [B, C] D, L	[S, S&T, T]	//Closed|| 250 mm   x 1-1/4   x 13/32in	Rietz.  Single line model 60/1 discontinued ca 1930.	Tamaya 4470, 4471 (1932)
	193x-42	Pic	K, A [B, C] D, L with over-range
61/3	1932-42		Same as 60/3 but with decimal-indicating cursor.
62/3	1932		K, A [B, C] D, L	[S, S&T, T]	//Closed|| 150 mm	Extra Fine Rietz.	Tamaya 4472, 4473 (1932)
63/3	1932		Same as 62/3 but with decimal-indicating cursor.
64, 64/1, 64/3	1932-68	Pic	K, A [B, CI, C] D, L with over-range	[S, S&T, T]	//Closed|| 250 x 34   x 11 mm	"System Rietz."  {64/3 hairlines: D: C, C}  Some w 13-0-13 cm on bottom.  Probably without over-range before 1935.	Tamaya 4474 (1932)
64T	1965-1971	Pic	K, A [B, BI, CI, C] D, DI, L with over-range	[T2, T1, ST, S]	//Closed|| 250 x 34   x 11 mm	Super Rietz.  {3 hairlines: D: C, C}.
65	1932-42	Pic	Same as 64/3 but with decimal-indicating cursor.		//Closed|| 250 x 34   x 11 mm		Tamaya 4475 (1932)
66	1932-68	Pic	K, A [B, CI, C] D, L with over-range	[S, S&T, T]	//Closed|| 150 x 26   x 9 mm	Extra Fine Improved Rietz. {3-line cursor: D: C, C}  Some 8-0-8 cm on bottom.	Tamaya 4476 (1932)
66F	1936-42	Pic	Same as 66 but thin.
67	1932-42		Same as 66 but with 3-line magnifying cursor.				Tamaya 4477 (1932)
68	1932-42		Same as 66 but with 3-line decimal-indicating cursor.				Tamaya 4478 (1932)
69	1932-42		Same as 66 but with 3-line decimal-indicating magnifying cursor.				Tamaya 4479 (1932)
70	1932-43	Pic	K, A [B, CI, C] D, L some with over-range	[S, S&T, T]	//Closed|| 500 x 34   x 12 mm	Long Improved Rietz.  {3 hairlines: D: C, C}.	Tamaya 4480 (1932)
	1951-70	Pic			//Closed|| 500 x 40   x 12 mm
72	1966-71	Pic	K, DF [CF, CIF, CI, C] D, A with over-range Folded at √10	[TI2, TI1, L, SI]	//Closed|| 500 x 40   x _ mm	"Precision Slide Rule for Practical Engineers." Single hairline.
74	1937-EOB	Pic	K. A [B. CI. C] D, L with over-range	[S, S&T, T]	//Closed|| 125 x 26   x 5 mm	Pocket Improved Rietz. {3 hairlines: D: C, C}.
Models 80-89: "Electro" Slide Rules
80 80/1 80/3	1932	PIc	LL2, A [B, CI, C] D, LL3 No over-range	[S,L, T] (S keyed to A/B) E, F widely separated in gutter.	//Closed|| 250 mm x 1-1/4 in x 10 mm	Electro.  LL scales keyed to offset "W" gauge mark.  No over-range.  Same as model 3 with CI scale added.	Hemmi 3; Tamaya 4481, 4482 (1932); H-O 1770 (-1928-c50); Post 1456 (c1934-WWII)
	1932-33	Pic			//Closed|| 250 x 34 x 11 mm	Same as preceding but on slightly wider body.
	1934-36	Pic		[S, L, T] (S keyed to A/B) E, F close together in gutter.		Same as preceding but no "W" gauge mark.  E, F close together in gutter.
	1936-52	Pic	LL2, A [B, CI, C] D, LL3 with over-range			Same as preceding but with over-range extensions.
81/1, 81/3	1932-42	Pic	Same as 80/1, 80/3 but with decimal-indicating cursor.		//Closed|| 250 x 34   x 11 mm	Details vary depending upon date of manufacture.	Hemmi 4; Tamaya 4482, 4484 (1932)
82	1932-37		Same as 80/1 except short.		//Closed|| 125 x _ x 9 mm		Tamaya 4485 (1932)
83	1932-37		Same as 82 but with decimal-indicating cursor.				Tamaya 4486 (1932)
84	1932		Same as 82 but with magnifying cursor.				Tamaya 4487 (1932)
85	1932	Pic	Same as 82 but with magnifying decimal-indicating cursor				Tamaya 4488 (1932)
85	MIOJ	Pic	db, Neper, A [B, CI, C] D	[TI2, TI1, L, SI1]	//Closed|| 250 x 34   x 11 mm	{3 hairlines: A: C2, 1.307}  (Why 1.307?) Not electro, therefore model number 85 is inappropriate.	Rare.
80K	1953-70	Pic	E, F, A [B, CI, C] D, LL2, LL3 with over-range	[S, L, T]  (S keyed to A/B) Bottom Edge: K	//Closed|| 250 x 34   x 11 mm	Electro.  K scale on bottom edge; no scales in gutter.  No hp mark but different cursors avail for British/US and French/Metrc HP.  {3-line cursor: A: hp, C2}.
86/3	1936-42		LL2, A [B, CI, C] D, LL3 with over-range	[S, L, T] (S keyed to A/B) Gutter: E, F	//Closed|| 150        x 26 mm	Extra fine Electro. Hp gauge mark.  No W mark. E,F scales close together in gutter.   {Three hairlines: A: hp, C2}.
86/3K	1950	Pic	LL2, A [B, CI, C] D, LL3 with over-range	[S, L, T] (S keyed to A/B) Gutter: E, F Bottom Edge: K	//Closed|| 150 x 26   x 8 mm	Same as model 86/3 except K scale added to bottom edge.
86	1951					Identical to and contemporaneous with model 86/3K.
86K	1954-70	Pic	E, F, A [B, CI, C] D, LL2, LL3 with over-range	[S, L, T] (S keyed to A/B) Bottom Edge: K	//Closed|| 150 x 26   x 8 mm	Extra Fine Electro.   No scales in gutter, no hp mark. {Three hairlines: A: hp, C2}.
87/3	1936-42		Same as 86/3 but with magnifying cursor.		//Closed|| 150       x 26 mm
Models 90-99:  Stadia Slide Rules
90	1932-42	Pic	L, D [M1, M2, C] D, A          with over-range	[S, S&T, T] Bottom Edge: K, IA	//Closed|| 250 x 34   x _ mm	Stadia. {3 hairlines: D: C, C}. Two calculating scales on bottom edge.    IA scale read from offset pointer keyed to rightmost hairline.
90A	1940		Same as 90
90B	1939?	Pic	Same as 90 but using "centesimal degrees." (100 centesimal degrees = right angle)			First of a proposed series (models 90B, 91B, 2690B) of centesimal-degree stadia rules.  Models 91B and 2690B never manufactured.
91	1932-42	Pic	Same as 90 but with decimal-indicating cursor		//Closed|| 250 x 34   x _ mm		Tamaya 4490 (1932)
91A	1939?		Same as 91.			"91A" used to distinguish this rule from proposed centesimal degree model 91B.
92	1932-42	Pic	L, D [M1, M2, C] D, A	[S, S&T, T]   Bottom Edge: K, IA	//Closed|| 150 x 26   x 9.6mm	Extra Fine Stadia.  Two calculating scales on bottom edge.  {3 hairlines: D: C, C}.	Tamaya 4491 (1932)
93	1932-42	Pic	Same as 92 but with magnifying cursor.				Tamaya 4492 (1932)
94	1932-42		Same as 92 but with decimal-indicating cursor.				Tamaya 4493 (1932)
95	1932-42		Same as 92 but with decimal-indicating magnifying cursor.				Tamaya 4494 (1932)
96	1936-43	Pic	L, D [M1, M2, C] D, A with over-range	[S, S&T, T]   Bottom Edge: K, IA	//Closed|| 500 x 34   x 11 mm	Long 90. {3 hairlines: D: C, C}.  Two calculating scales on bottom edge.  IA scale read from offset pointer keyed to center hairline.
Model Numbers 100-107 were assigned to new rules developed in 1926-27; replaced by modern numbering system about 1930.
100	1926-27	Pic	A [B, CI, C] D	[S, L, T] (S keyed to A/B)	//Closed|| 250 mm	Short lived.	Tamaya 2790 (1927)
101	1926-27	Pic	Same as 100 but with decimal indicating cursor.				Tamaya 2791 (1927)
102	1926-28	Pic	A [B, CI, C] D, K	[S, L, T] (S keyed to A/B)	//Closed|| 250         x 28 mm	Improved Mannheim.   Model number changed to 50/1 ca 1928.	Tamaya 2792 (1927), H-O-1771
103	1926-28	Pic	Same as 102 but with decimal-indicating cursor.			Model number changed to 51/1 ca 1928.	Tamaya 2793, (1927)
104	1927	Pic	LL2, A [B, CI, C] D, LL3 No over-range	[S, L, T] (S keyed to A/B) Gutter: E, F	//Closed|| 125 mm	Pocket Electro.  LL scales keyed to offset W gauge mark.  E,F scales separated in gutter.  No over-range.   Hp gauge mark.	Hemmi 82; Tamaya 2994 (1927)
105	1927	Pic	Same as 104 but with decimal-indicating cursor.				Hemmi 83, Tamaya 2995
106	1927		Same as 104 but with magnifying cursor.				Hemmi 84, Tamaya 2996
107	1927		Same as 104 but with magnifying decimal-indicating cursor.				Hemmi 85, Tamaya 2997
Models 100-109: Large Classroom Demonstration Rules
100	1951-68	Pic	DF [CF, CI, C] D, A Folded at √10.	[TI, L, SI]	Demo 1000 mm	Demonstration version of model 45.
100K	1969-71		K, DF [CF,CI, C] D, A Folded at √10.	[TI, L, SI]	Demo 1000 mm	Demonstration version of model 45K
101	1951-68		l, A [B, CI, C] D	[S, K, T] (S keyed to C/D)	Demo 1000 mm	Demonstration version of model  2640.
101A	1967-EOB	Pic	A [B, CI, C] D, K	[S, L, T] (S keyed to C/D)	Demo 1000 mm	Demonstration version of models 40RK & 43A.
102	1954-68	Pic	CI, C, [D, A]	Blank	Demo 1000 mm	Demonstration version of model 22.
103	1959-EOB		K, DF [CF, CIF, CI, C] D, A Folded at √10.	[TI1, TI2, L, SI]	Demo 1500 mm	Demonstration version of model 2664S.
104	1959-69				Demo 1000 mm	Demonstration
107	1969-EOB		LL3, LL2, DF [CF, CIF, CI, C] D, L, LL1    Folded at √10.	K, A [B, TI1, TI2, SI] D, DI	Demo 1000 mm	Demonstration version of model P253.
108	1971?		LL/1, LL/2, LL/3, DF [CF, CIF, CI, C] D, LL3, LL2, LL1 Folded at√10	K, A [B, TI, SI, C]  D, DI, L	Demo 1000 mm	Demonstration version of model 254W.
Models 110-129: Reserved for Specialty Rules but Hardly Used
110	1937-MIOJ	Pic	LL2, A [B, CI, C]  D, LL3 with over-range	[S, S&T, T] Bottom Edge: K	//Closed|| 250 x 34   x 11 mm	Mechanical /Electrical.  K scale on bottom edge. {Three hairlines: D: C, C}.
120	1939?	Pic	L, K, A [B, CI, S1, T1, C] D,SΘ with over-range	[LL3, LL3, LL2, LL2, LL1, LL1] Bottom Edge: GΘ (2 scales)	//Closed|| 250 x 34   x 11 mm	"MIGHT."  Listed without description by Katsunori Kadokura (Chronology of Japanese Hemmi Slide Rules, Journal of the Oughtred Soc, Vol 1, No 2, August 1992). Pictured specimen identified as Model 120 by Yukio Kubota, March 2014.
DP121	1968-69	Pic	LL3, LL2, DF [CF, CIF, C] D, L, LL1	K, A [B, TI2, TI1, SI] D, DI	Projectn 305X182 X 12 mm	Overhead projection rule for model P253.  Sold with five masks for obscuring irrelevant scales.	¥10,000 in catalog dated 6911.
DP122	1968-69	Pic	K, A, DF [CF, CIF, CI] D, DI, L	K, A, DF [B, TI2, TI1, SI, C] D, DI, L	Projectn 305X182 X 12 mm	Overhead projection rule for models 2662 and 2664S.  Sold with five masks for obscuring irrelevant scales.
Models 130-139: Darmstadt (L, K, A [B, CI, C] D, Cos, Sin, Tg and [LL1, LL2, LL3]) and Variants
130	1950-69	Pic	L, K, A [B, CI, C] D, Cos with over-range	[LL1, LL2, LL3] Bottom Edge: SIN tg	//Closed|| 250 x 34   x 11 mm	Darmstadt.  S and T scales on bottom edge of rule. {3 hairlines: D: hp-C, C}.
130W	1970-72	Pic	T, K, A [B, BI, CI, C] D, P, S with over-range	[L, LL0, LL1, LL2, LL3]	//Closed|| 250 mm   x 1-1/2   x 7/16 in	Advanced Darmstadt.  Unique width. {3 hairlines: A: C2, hp-C2}.
135	1959-71	Pic	T, K, A [B, CI, C] D, P, S with over-range	[L, LL1, LL2, LL3]	//Closed|| 125 x 26   x 5 mm	Pocket Darmstadt.  {3 hairlines: D: hp-C, C}.
P135k	2005	Pic	T, K, A [B, CI, C] D, P, S with over-range	[L, LL1, LL2, LL3]	Closed 200 x 32   x 4.3mm	Darmstadt.  Only 250 made.   Manufactured in 2005 to specs of ISRG and Japanese collectors and sold by subscription.
136	1951-68	Pic	L, K, A [B, CI, C] D Cos with over-range	[LL1, LL2, LL3] Bottom Edge: SIN tg	//Closed|| 150 x 26   x 8 mm	Extra Fine Darmstadt.  D scale is labeled "SIN" other scales not labeled.
Models 140-149: Pocket Duplexes
140	MIOJ	Pic	DF [CF, CI, C] D, L Folded at √10.	K, A [B, TI, SI, C] D, DI	Duplex 150 mm   x 1-3/16  x 1/4 in	Hemmi's first "pocket" duplex.  Body is short version of old narrow model 150.
141 P141	1960-EOB	Pic	LL/1, LL/2, LL/3, DF [CF, CIF, CI, C]  D, LL3, LL2, LL1 Folded at π	T, S, U, P [Q, c, V, R]  A q, n, L	Duplex 125 x 34   x 4 mm	Air conditioning duct design.  Bamboo (141) and all-plastic (P141) versions.  Same blank as 149.    All-plastic version marked "'Carrier' Ductuler" (Toyo Carrier Corp).  Some bamboo versions carry no brand name, some marked "Carrier 50210," others marked "Shin Nippon Kucho."  (SNK was spun off from Toyo Carrier in 1969.)
143	1968-69	Pic	P1, P2, DF [CF, CIF, CI, C] D, LL (2 scales.  One has second calibration for %)             Folded at 3.6	A, N [M, £, S/d, C] D, G	Duplex 125 x 34   x 4 mm	"Commerce."  N, M have 365 division for dates.  £, S/d = pound, shilling/pence.  G is a set of conversion gauge marks.	Pocket version of Hemmi model P263.
149	1959- 1962	Pic	LL/1. LL/2, LL/3, DF [CF, CIF, CI, C] D, LL3, LL2, LL1    Folded at π.	L, K, A [B, TI, SI, C] D, LL0, LL/0	Duplex 125 x 34   x 4 mm	"Pocket 259D" but actually closer to 259 with TI, SI instead of T, S, ST.  Hemmi name on back of rule.  Bare bamboo edges.
149A	1962-EOB	Pic				Same as 149 except celluloid veneer covers edges.
P149A	1976?	Pic	LL/1. LL/2, LL/3, DF [CF, CIF, CI, C] D, LL3, LL2, LL1 Folded at π	L, K, A [B, TI, SI, C] D, LL0, LL/0	Duplex 125 x 36   x 4 mm	All plastic. About 10 mm longer overall and 2 mm wider than bamboo 149A.
Models 150-300:  Ten- and Twenty-Inch Duplex and Open Body Rules
150	1925?-1932?	Pic	DF [CF, CIF, C] D Folded at π.	K, A [B, S, T, CI] D, L	Duplex 250 mm  x 1-3/16   x 1/4 in	Hemmi's first duplex (but Hemmi called early models 150, 152, 153 and 154 "Universal," not "duplex.")   Copied from K&E 4088-3 whose narrow width it duplicates.	Post 1458 (1931)  Lietz 3054L (before 1932)
	1932?-MIOJ	Pic			Duplex 250 mm   x 1-5/8   x 1/4 in	Standard width.  Replaced by model 250.	Tamaya 4497 (1932) Post 1458 (1932-WWII) US Blue 1881 (--1937--) H O 1765 (1935-MIOJ)
152	1925-48	Pic	K, A [B, CI, C] D, T	Θ, Rθ, P [Q, Q', C] LL3, LL2, LL1	Duplex 250 mm   x 1-5/8   x 1/4 in	Electrical Engineer's Universal (Duplex).  Often no model number.  Some marked "US Pat 1459857."  (Issued to O D Parsons in 1923 for P, Q scales.)	Tamaya 4498 (1932); Post 1459 (c1933-WWII); H-O 1766 (-1935-48-); US Blue 1889 (1930s) Lietz (1930s)
153	1931-69	Pic	L, K, A [B, CI, C] D, T Gθ	Θ, Rθ P, [Q, Q', C] LL3, LL2, LL1	Duplex 250 mm   x 1-5/8   x 1/4 in	Electrical Engineer's Universal (Duplex).  Some (c1938) with stator screws on back of rule. US Patent 2079464, May 4, 1937.	Post 1461 (c1933-WWII); US Blue 1893 (1030s)
154	1925-69	Pic	DF, P', P [Q, CF, CI, Sθo] A, D, K    Folded at π.	Sχ, Tχ, Tθ [Th, Sh, Sh C] D, L, χ	Duplex 500 mm   x 1-3/4   x 1/4 in	Electrical Engineer's Universal (Duplex) 20."  Two cursors.  Early have scale letters eteched on cursor glasses.	Tamaya 4499 (1932); Post 1460 (c1933-WWII)
155	WWII-1951	Pic	K, A, DF [CF, B, CI, C] D, L Folded at √10.	Sh1, Sh2, Th1 [TI2, TI1, SI1, C]  D, DI	Duplex 250 mm   x 1-5/8   x 1/4 in	General Engineering with Hyperbolic Scales.  Replaced by model 255.
157	WWII-1950	Pic	K, A, DF [CF, B, CI, C] D, L     Folded at √10.	LL/1, LL/2, LL/3 [TI2, TI1, SI1, C]  LL3, LL2, LL1	Duplex 250 mm   x 1-5/8   x 1/4 in	General Engineering with Log-Log Scales.
159	1949-52	Pic	T, DF [CF, CIF, CI, C] D, S, ST   Folded at π.	LL0, LL00, A [B, K, L, C] LL3, LL2, LL1	Duplex 250 mm   x 1-5/8   x 1/4 in	Replaced by model 259 (Expert Mechanical Engineer) c1952.	Post 1462H "POSTRIG"  (c1949 - 53)
160	1951	Pic	Nomogram1(α=0.05), χ2, A [B, CI, C]  D, φ, ax	P, F'1 [F'2, a']  A, χ2,  ,Nomogram2(α=0.01)	Duplex 250 mm   x72.5mm	Inductive Statistics.  Almost three inches wide!  Stator with nomograms is about 46 mm wide. All-plastic cursor similar to Relay/Ricoh.
165	1953	Pic				Statistical Sampling.  No slide, just many short scales and a cursor.
190	1939-42	Pic	K, A [B, R2, R1, C]  D, DI	[SI2, SCI2, SI1, SCI1] Bottom Edge: L	Closed 250 x 40 x 11 mm	"Precision Stadia" {3 hairlines: D: C, C}.  Left half of SCI1 scale is inverse cos2.
200	1936-68	Pic	D6, D5, D4 [C6, C5, C4, C3, C2, C1] D3, D2, D1	DF6, DF5, DF4 [CF6, CF5, CF4, CF3, CF2, CF1] DF3, DF2, DF1   Scales folded at 12√10.	Duplex 400 mm   x 1-3/4   x 1/4 in	Precision Duplex.  (Originally known as "Ultra accuracy.")   Four digit precision.  Scales are cut into six segments, each 400 mm long.  Early production has scale labels in green on cursor.  U S Patent 2235106A, March 18, 1941.
201	1967-69	Pic	L2.4, L1.3, A2.4, A1.3 [C4, C3, C2, C1] D1, D2, D3, D4	K4, K3, K2, K1 [CF4, CF3, CF2, CF1] DF1, DF2, DF3, DF4  Scales folded at 8√10.	Duplex 500 mm   x 1-3/4   x 1/4 in	"Sold in Japan."   Early production has scale labels in green on cursor.
250	1950-EOB	Pic	DF [CF, CIF, CI, C] D, L     Folded at √10.	K, A [B, TI1, TI2, SI] D, DI	Duplex 250 mm   x 1-5/8   x 1/4 in	General Engineering and Business.  Replaced models 150 and 2600.  About a third have anodized black end brackets.
251	1951-58	Pic	L, DF [CF, CIF, CI, C] D, DI Folded at π.	K, A [B, T, S, ST, C] D, LL3, LL2, LL1	Duplex 250 mm   x 1-5/8   x 1/4 in	Mechanical Engineer.
	1958-EOB	Pic	L, DF [CF, CIF, CI, C] D, LL3, LL2, LL1        Folded at π.	K, A [B, T, S, ST, C] D, DI			H-O 1773
P253	1961-EOB	Pic	LL3, LL2, DF [CF, CIF, CI, C] D, L, LL1       Folded at √10.	K, A [B, TI2, TI1, SI] D, DI  TI1 subdivisions = 20'	Duplex 250 x 41 x 5 mm	"Vectolog."  Elaborate clamshell case.  All-plastic version of model 264.  ¥2.400 in catalog 6911.	H-O 1774-00 (-1964); Geo 341-3130 (1964+)
P253 Special	1967	Pic	As P253 except CIF scale in green.	As above except TI1 subdivisions = 10'.		Marked "P253 Special" and "Vectolog."  Only significant difference from P253 is addition of "Special" to model number.
	1965	Pic	LL3, LL2, DF [CF, CIF, CI, C] D, L, LL1       Folded at √10.	K, A [B, TI2, TI1, SI] D, DI,√3V.     TI1 subdivisions = 10'		Note short additional scale on back marked "√3V" at left and and "volt" at right end.
254W	1964-66	Pic	LL/1, LL/2, LL/3, DF [CF, CIF, CI,  C] D, LL3, LL2, LL1 Folded at √10.	K, A [B, TI, SI, C]  D, DI, L	Duplex 250 mm   x 1-3/4   x 1/4 in	"High School Students".  Basis for model 108 demo rule.  Equal length stators
	1963-72	Pic				Traditional stators.
254 W-S	1970s	Pic	Same as 254W but folded at π.	K, A [B, TI, SI, C]  D, DI, L		Only difference from 254W above is where front scales are folded.	Only two specimens known. Date codes "RC" (March 1967) and "UB" (Feb 1970)
	1969	Pic	Same as 254W but folded at √10.	L, K, A [B, TI, SI, P] Q, Q', D, DI		With P, Q, and Q' scales.	Date code "TC."
	1970s	Pic		K, A, [SIN COS, COS2, TI, SI, C]  D, DI, L		With stadia scales.	Equal stators date = "OC"; others = "UB" or no code.
	1971	Pic		K, A [B, TI2, TI1, SI, C]  D, DI, L		"High School Students."  Traditional stators.   Hemmi name on back of rule.
	1971	Pic	Same as 254W but folded at π.	K, A [B, TI2, TI1, SI, C]  D, DI, L			Date code "VC" = March 1971.
	1970s	Pic		KI, K, AI, A [B, S, T, CI, C]  D, Ldb, P, DI		May set record for number of different inverse scales on one side of a rule.
254 WN	1972	Pic	LL/1, LL/2, LL/3, DF [CF, CIF, CI,  C] D, LL3, LL2, LL1 Folded at √10	LL/0, K, A [B, TI2, TI1, SI, C]  D, DI, L, LL0		"High School Students."  Traditional stators.   Hemmi name and model number on back of rule.
254 WN-S	1972	Pic	Same.  Folded at π.
	1973	Pic	Same.  Folded at √10	L, K, A, [B, TI2, TI1, SI, P] Q, Q', D, DI
255	1950-57	Pic	L, K, DF [CF, CIF, CI, C] D, χ, θ   Folded at π.	Sh1, Sh2, Th, A [B, TI2, TI1, SI, C]  D,LL3,LL2,LL1	Duplex 250 mm   x 1-3/4   x 1/4 in	Expert Electrical Engineer.   Replaced model 155.
	1958-62	Pic	L, K, DF [CF, CIF, CI, C] D, LL3, LL2, LL1    Folded at π.	Sh1, Sh2, Th, A [B, TI2, TI1, SI, C]  D, χ, θ
255D	1963-EOB	Pic	L, K, DF [CF, CIF, CI, C] D, LL3, LL2, LL1    Folded at π.	Sh1, Sh2, Th, A [B, TI2, TI1, SI, C]  D, DI, χ, θ
256	1950-68	Pic	L/dB, Neper, DF [CF, CIF, CI, C] D, LL3, LL2, LL1 Folded at π.	A, Ĺ [Ċ, SI, TI] D, l, F	Duplex 250 mm   x 1-3/4   x 1/4 in	Electrical Communications.  Ĺ, Ċ are L and C with dot over; these scales are about half length.
257	1952-68	Pic	L, A, DF [CF, CIF, CI, C] D, LL3, LL2, LL1 Folded at π.	Ch A-M, Ch N-Z, M1 [M2, oF, oC, oK, F(t)] Kg/cm2, mm Hg, in Hg Vac, tw		Chemical Engineer.	Post 1491 (c1957-c67); H-O 1770 (-1958-)
257L	1971-EOB	Pic	L, K, A, DF [CF, CIF, CI, C] D, LL3, LL2, LL1 Folded at π.	Ch A-M, Ch N-Z, M1 [M2, oF, oC, oK, LM] mm Hg, Kg/cm2, in Hg Vac, tw		Chemical Engineer.   Hemmi name on back of rule.
258	1951	Pic	LL0, LL/0, K, DF [CF, CIF, CI, C] D, R1, R2, L Folded at π.	LL/1, LL/2, LL/3 [T T, SecT ST, Cos S, C] D, LL3, LL2, LL1	Duplex 250 mm   x 1-3/4   x 1/4 in	VERSALOG Ia.  About 30 specimens explicitly marked "Hemmi 258" are known. All are also marked "THE FREDERICK POST CO. NO 1460" or "THE HUGHES OWENS CO. LIMITED NO. 1777."   Hemmi name on back of rule.	Post 1460 Versalog (1951+); H-O 1777 Versalog (1951+). For information about Versalog II slide rules see the second page of this Catalogue Raisonne.
259	1950-58	Pic	L, K, DF [CF, CIF, CI, C] D, LL/0, LL0     Folded at π.	LL/1, LL/2, LL/3, A [B, T, S, ST, C] D, LL3, LL2, LL1	Duplex 250 mm   x 1-3/4   x 1/4 in	Expert Mechanical Engineer.  Replaced model 159.
	1958-63	Pic	LL/1, LL/2, LL/3, DF [CF, CIF, CI, C] D, LL3, LL2, LL1       Folded at π	L, K, A [B, T, S, ST, C] D, LL0, LL/0		Expert Mechanical Engineer.  Hemmi name moved to back of rule.
259D	1953-EOB	Pic	LL/1, LL/2, LL/3, DF [CF, CIF, CI, C] D, LL3, LL2, LL1      Folded at π	L, K, A [B, T, S, ST, C] D, DI, LL0, LL/0
259 DS	1970s	Pic	LL/1, LL/2, LL/3, DF [CF, CIF, CI, C] D, LL3, LL2, LL1  Folded at π.	LL0, LL/0, K, A [B, T, S, ST, C] D, √1, √2, L	Duplex 250 mm   x 1-3/4   x 1/4 in
260	1964-EOB	Pic	LL/1, LL/2, LL/3, DF [CF, CIF, CI, C] D, LL3, LL2, LL1 Folded at π.	LL/0, LL0, K, A [B, T, S, ST, C] D, DI, P, L	Duplex 250 mm   x 1-3/4   x 1/4 in	Advanced Engineer.  {3 hairlines: A: C2, hp-C2}  Some rules c1970 have brand and model on bottom edge.  Some marked UNIVERSITY on bottom edge.  ¥4,800 in catalog 6911.
260	1964	Pic	LL/1, LL/2, LL/3, DF [CF, CIF, CI, C] D, LL3, LL2, LL1 Folded at π.	LL/0, LL0, K, A [B, T, S, ST, C] D, DI, P, L	Duplex 1500 mm x _	Painted wood classroom demonstration  rule.  Cursor is single wire.
P261	1965-EOB	Pic	LL01, LL02, LL03, DF [CF, CIF, CI, C] D, LL3, LL2, LL1 Folded at π.	T, ST, K, A [B, BI, CI, C] D, L, P, S	Duplex 250 x 46  x 5 mm	Advanced Engineer (Darmstadt).  Stators white or pale blue.  {4 hairlines on back of cursor. A: C2, hp-C2, D: C}	T-P 1420 (c1971 only) T-P 44CB-200 (1972+) Geo 341-3660
P262	1965-EOB	Pic	LL01, LL02, LL03, DF [CF, CIF, CI, C] D, LL3, LL2, LL1     Folded at π.	K, A, R1, R2 [T2, T1, ST, S, C] D, L, LL00, LL0	Duplex 250 x 46  x 5 mm	Advanced Engineer (Rietz).	T-P 1422 (c1971 only), T-P 44CB-220 (1972+)
P263	1965-69	Pic	P1, P2, DF [CF, CIF, CI, C] D, LL  (2 scales.  One has second calibration for %) Folded at 3.6	A, N [M, £, S/d, C] D, G	Duplex 250 x 41 x 5 mm	"Commerce."  N, M have 365 divisions for dates.  £, S/d = pound, shilling/pence.   G is a set of conversion gauge marks .	Geo 341-3155 (1967+) Hemmi 143 is pocket version.
264	1968-EOB	Pic	LL3, LL2, DF [CF, CIF, CI, C] D, L, LL1       Folded at √10.	K, A [B, TI2, TI1, SI] D, DI.	Duplex 250 mm   x 1-5/8   x 1/4 in	Bamboo version of model P253, Vectolog.
264-M		Pic	LL3, LL2, DF [CF, CIF, CI, C] D, L, LL1       Folded at √10.	K, A [B, TI2, TI1, SI] D, DI.		Same as 264?	Only known specimen sold on Japanese auction June 2018.
264-S	1969	Pic	LL3, LL2, DF [CF, CIF, CI, C] D, L, LL1       Folded at √10.	K, A [B, TI2, TI1, SI] D, DI.		Same as 264 except CIF scale is green.	Two specimens known.  Date codes "TB" (Feb 1969) and "VD" (Apr 1971).
264-S	1970s	Pic	LL3, LL2, DF [CF, CIF, CI, C] D, L, dB, LL1       Folded at √10.	K, A [B, TI2, TI1, SI]  D, DI, χ, θ	Duplex 250 mm   x 1-5/8   x 1/4 in	Same as 264 except with χ and θ scales and 0 - 20 dB markings added to L scale.
P265	1968-72	Pic	P1, P2, DF [CF, CIF, CI, C]  D, LL2, LL1     Folded at 3.6	A, D [G,  0-24, N]  M, 0-24	Duplex 250 x 46 x 4 mm	"Business."  N, M have 365 divisions for dates.   G is a set of conversion gauge marks.  Instructions, scale labels in Japanese.
266	1961-EOB	Pic	LL/3 (and LL/1), LL/2, LL2, A [B, BI, CI, C] D, dB L, S, T	XL, XC, F, r1 (and P) [r2 (and Q), L, C, CZ] L, Z, fo (and l)	Duplex 250 mm   x 1-3/4   x 1/4 in	"Electronics."  Announced in 1961 but not in Hemmi catalogs until 1966.  Early specimens (1962) marked "Developed by SONY."  LL/3, LL/1, r1, r2, P, Q are partial length scales.  Also sold as Geo 341-3550 (1966+)
P267	1971-EOB	Pic	³√-3,  ³√-2, ³√-1, DF [CF, CIF, CI, C]  D, √-1, √-2, δ(unif.) Folded at √10	4√-4, 4√-3, 4√-2, 4√-1 [λδ(conc),  λδ(Trape),  λM,  P] Q, L, T, S	Duplex 250 x 46 x 5 mm	"Structural Design"
269	1965-EOB	Pic	L, F, K, A [B, K', CI, C] D, LL3, LL2, LL1	CL, SL, M, TL [R, ST, T, S, C] D, DI, SinCos1, SinCos2	Duplex 250 mm   x 1-3/4   x 1/4 in	Civil Engineer.
P270	1971-EOB	Pic	J,  J [T(ºK), Q(m³/s), Q(m³/s)]  Hm(m), Q(m³/s), Ht(m)	X, X, Cz, Cmax(PPM)  [He(m), Cy, CI, C]  D, A, L	Duplex 250 x 46 x 5 mm	"Pollution A."  (air quality analysis)  19 scales in black red and blue.
P271	1974	Pic	x,xs(g/kgDA),  (ice),  Tφ,tφ(ºC),   [hw,hs(mmhg), CI, C]  D,   v,va(m3/kgDA),   t(ºC),   t(ºF)	[t(ºC)(ice),   t'2.5,   t(ºC)]	Open 250 x 46 x 5 mm	Moist air.  There are 13 scales--most with complicated labels.
274	1973-EOB	Pic	L, DF [CF, CIF, CI, C]  D, LL3, LL2, LL1 Folded at √10	K, A [B, TI2, TI1, SI, C]  D, DI	Duplex 250 mm   x 1-3/4   x 1/4 in	Late model general engineering rule with scales folded at √10 and trig scales inverted.  Likely sold only in Japan.
274-S		Pic		K, A [B, TI2, TI1, SI, C]  D, DI, dB
275	1950-58	Pic	L, K, DF [CF, CIF, CI, C] D, c, q      Folded at π.	Sh1, Sh2, Th, A [B, TI1, TI2, SI, C] D,LL3,LL2,LL1	Duplex 500 mm   x 1-3/4    x 1/4 in	20-inch Version of Model 255.
	1958-63	Pic	L, K, DF [CF, CIF, CI, C] D, LL3, LL2, LL1    Folded at π.	Sh1, Sh2, Th, A [B, TI2, TI1, SI, C]  D, χ, θ		20-inch Version of Model 255. Some w green scale labels on cursor.
275D	1963-69	Pic	L, K, DF [CF, CIF, CI, C] D, LL3, LL2, LL1    Folded at π.	Sh1, Sh2, Th, A [B, TI2, TI1, SI, C]  D, DI, χ, θ		20-inch Version of Model 255D. Some w green scale labels on cursor.
279	1950-58	Pic	L, K, DF [CF, CIF, CI, C] D, LL0, LL/0        Folded at π.	LL/1, LL/2, LL/3, A [B, T, S, ST, C] D, LL3, LL2, LL1	Duplex 500 mm   x 1-3/4    x 1/4 in	20-inch Version of Model 259.  Some w green scale labels on cursor.
	1958-63	Pic	LL/1, LL/2, LL/3, DF [CF, CIF, CI, C] D, LL3, LL2, LL1 Folded at π.	L, K, A [B, T, S, ST, C] D, LL0, LL/0
279D	1963-69	Pic	LL/1, LL/2, LL/3, DF [CF, CIF, CI, C] D, LL3, LL2, LL     Folded at π.	L, K, A [B, T, S, ST, C] D, DI, LL0, LL/0		20-inch Version of Model 259D. Some w green scale labels on cursor.
P280	1959-72	Pic	T, K, A [B, CI, C] D, L, S, ST	[LL1, LL2, LL3]	Open 250 x 46 x 4 mm	Beginners.	T-P 1414 (c1971 only), 44BB-140 (1972+); Geo 341 3645; Ahrend P280.
280S	1976?	Pic	L, K, A [B, CI, C] D, S, ST, T	cm  [LL1, LL2, LL3]  inches	Open 250 mm	All plastic.  Marked "HEMMI, JAPAN, 280S" but probably made by D&P in Germany.  Only known specimen found in Thailand.	Ahrend P281; Same as Aristo 0903 except back of Aristo slide is blank.
P281	1970-72	Pic	T, K, A [B, CI, C] D, L, S, ST	Blank	Open 250 x 46 x 4 mm	Rietz.	T-P 1410 (c1971 only), 44BB-100 (1972+); Geo 341 3640
P283	1970-71	Pic	K, A, DF [CF CI, C] D, L, T, S Folded at π.	[LL1, LL2, LL3]	Open 250 x 46 x 4 mm	Beginners.	Ahrend P283.
300	WWII	Pic	G, E [F, CI, C] D, M	[Blank]	//Closed|| 250 x 34 x 8.5mm	Decimal Calendar Rule.  G scale is folded at 365; E & F folded at 3.042 = 365/12. M scale is set of gauge marks for Japanese weights & measures. Japanese language.
Models 301-999: Specialty Slide Rules
301 301A	1954-69	Pic	t, ω [CI, f, P, C] D, A, db	[θ, θd, g', g]	//Closed|| 250 x 34 x 11 mm	Control Engineering.  Four cursors!  301A is 301 plus a transparent overlay.	Post 1490 (1957-ca67)
305	1959-70	Pic	TmV/S, l1 [l2, m, a] T, n	[N, F t, 6u]	//Closed|| 125x26   x _ mm	Acoustic Design.  Patent 225936, 225937.
400	1959-68	Pic	Y, A [B, CI, C] D, LL3, LL2, LL1	Ebeta, R(AI), Dist, Dose Rate, S, Isotopes (4 scales)] Egamma, Pb, Fe, Al	Duplex 250 mm   x 1-3/4   x 1/4 in	Radioisotope Engineering.
401	1966-69	Pic	d, W [Nt, D, MI, M]  L	t0, P [d, D, D, Na( δ)]  k(P), d	Duplex 250 mm   x 1-5/8   x 1/4 in	"Coiled Spring Rule"
P402	1966-69	Pic	15 scales in black, red, blue and green -- all labeled in Japanese.  Only three scales are full length.  Scale arrangement and range of variables differs slightly between the two models.	A, DF [CF, CIF, CI, C] LL (2 scales)  Folded at √10.	Duplex 250 x 41  x 5 mm	Tanabe Corporate Performance Analysis combines ten measures such as Marginal Profit Ratio and Total Equity Growth into a single corporate performance score.	Click here for an illustrated explanation of models P402 and P403 by Atsushi Tomozawa.
P403	1966-69	Pic				P402 implements this technique for manufacturing businesses; P403 is for wholesale and retail distributors.  Rule and instructions in Japanese.
405	1950-68	Pic	C2F, Al2O3 [Fe2O3, C2AF]  C2A, SO3, CaSO4	C2S (A Scale), CaO [SiO2(for C3S), Fe2O3, SiO2(for C2S), SO3/Al2O3]  C3S, C2S (B Scale)	Duplex 250 mm   x 1-3/4   x 1/4 in	Cement Composition.  Scale labels are chemical symbols, numbers subscripted.  No scales are logarithmic. Fe2O3 and SiO2(for C2S) are separate short scales on same line.  Instruction Manual published by Portland Cement Assoc. Skokie, Ill, May 1959.
410	1959-69	Pic	G2, G1, F2, F1 [χ,  F1G1]  Z1+Z2,  G', F'	G2, G1, F2, F1 [χ, CI, C]  D, A	Duplex 250 mm   x 1-3/4   x 1/4 in	Involute of Gear Wheel.
451	1969	Pic	Eight specialized scales, center scales are not full length.	LL/3, LL/2, LL2, A [B, BI, CI, C]  D, dB L, S, T	Duplex 250 mm	"Field Intensity." There are essentially identical bamboo and all-plastic versions of this rule.  Plastic version is marked NO. 451, not NO P451.
P452	1968-72 (ForPost)	Pic	LL1, LL2, LL3, CR DF [T CF, CIF, % CI, T C] R D, L, in, cm Folded at π	ST, 3n-2 K, 2n-1 A [B, BI, CI, C] D, P, S, T	Duplex 250 x 46 x 4 mm	Business.  Some marked "System H. Kroon."  Yellow slide, green brackets.  (Post & TP have blue slide & brackets)	T-P 1426 (c1971 only), 44CB-260 (1972+)
500	1943		"For Airplane"		125 mm   x _	¥8.50 in 1943 price list.  No other mention.
640S	1972	Pic	K, DF [CF, CIF, CI, C] D, A, L Folded at √10.	[STI, TI2, TI1, SI, CI]	//Closed|| 250 x 45 x 9 mm	Desk Rule  Bamboo between thick plastic.
641	1975	Pic	K, A, DF [CF, CIF, B, CI, C]  D, DI, L Folded at √10.	[STI, TI2, TI1, SI, CI]	//Closed|| 250 x 45 x 9 mm	Desk Rule. Bamboo between thick plastic.
642T	1973	Pic	K, A [B, BI, CI, C] D, DI, L     with over-range	[T2, T1, ST, S]	//Closed|| 250 x 45 x 9 mm	Desk version of 64T. Bamboo between thick plastic.  {3 hairlines: D: C, C}.	Ahrend 643T
651	1969	Pic	K, A, DF [CF, CIF, B, CI, C] D, DI, L Folded at √10.	[TI2, TI1, STI, SI, C]	//Closed|| 250 mm x 1-1/2   x 7/16 in
Models 1xxx: Circular Slide Rules
1001	1971	Pic	A, D, C, CI, L	Blank	Circular 80 mm	Circular.	Geo 341-3910
1002	1971	Pic	A, D [C, CI]	Blank	Circular 80 mm	Circular.  Less elaborate than 1001.
2600 Series Rules Introduced in 1940 (February 11, 1940 was the 2600th Aniversary of the Founding of Japan)
2600	1940-51	Pic	DF [CF, CI, C] D, L Folded at √10.	K, A [B, TI2, TI1, SI1] D, DI	Duplex 250 mm   x 1-5/8   x 1/4 in	General Engineering and Business.
2634	1949-EOB	Pic	K, DF [CF, CI, C] D, A Folded at √10.	[TI2, TI1, L, SI]	//Closed|| 125 x 26  x 5 mm	Pocket 2664.
P 2634		Pic	K, DF [CF, CI, C]  D, A Folded at √10.	[TI2, TI1, L, SI]	||Closed|| 125 mm  x _
2640	1949-68	Pic	l, A [B, CI, C] D	[S, K, T] (S keyed to C/D)	||Closed|| 200 x 28  x 8 mm	Beginners Slide Rule for 50W.  Plastic cursor.
2641		Pic	DF [CF, CI, C] D, A Folded at √10.	Blank	||Closed|| 200 x 28  x 8 mm	Beginners Slide Rule for 45 (which, itself, was a beginner's rule).  Plastic cursor.
2645	WWII	Pic	DF [CF, CI, C] D, A Folded at √10.	[TI, L, SI]	Closed 200 x 28   x 8 mm	Essentially identical to model 45 except CI scale is black.	Only one specimen known.
2662	1966?-69?	Pic	K, A, DF [CF, CIF, CI, C] D, DI, L Folded at √10.	[B, TI, SI, C]	//Closed|| 250 x 34 x 11 mm	Some with 13-0-13 cm scale on bottom.	See Hemmi Catalogue Raisonne 2 for a slide projector version of this rule.
2664	WWII	Pic	K, DF [CF, CI, C] D, A+L Folded at √10.	[TI1, TI2, SI2, SI1]	||Closed|| 250 x 34  x 9 mm	Wartime construction (bare vertical edges and back)  No model number on rule.  A+L scale is left half of A scale joined to right half of L scale.
	MIOJ	Pic			//Closed|| 250 x 34 x 11 mm	Better quality construction (slanted top edge, bottom vertical edge and back all covered with celluloid.)
	1949-58	Pic	K, DF [CF, CI, C] D, A Folded at √10.	[TI2, TI1, L, SI1]		Full length A scale.  Full length L scale replaces SI2.
2664S	1958-69	Pic	K, DF [CF, CIF, CI, C] D, A               Folded at √10.	[TI2, TI1, L, SI]	//Closed|| 250 x 34 x 11 mm	Same as 2664 except 10 mm longer overall and green CIF scale added.	¥2,200 in catalog dated 6911.
2664 S-S	1967	Pic	K, A, DF [CF, CIF, CI, C] D, DI Folded at √10.	[TI2, TI1, L, SI]	//Closed|| 250 x 34 x 11 mm	Same as 2664S except DI scale added.
2670	MIOJ	Pic	K, A [B, CI, C] D, L	[S, S&T, T]	//Closed|| 500 x 40  x 12 mm	Long Rietz.  Short-lived replacement for model 70.  {3 hairlines: D: C, C}.
2690	1951-68	Pic	L, D [M1, M2, C] D, A	[S, S&T, T]	//Closed|| 250 x 34 x 11 mm	Stadia.  {3 hairlines: D: C, C}.
2690A	1954-55		Same as 2690			"2690A" used to distinguish this rule from proposed centesimal degree model 2690B.
Odds and Ends
P3526	1970s?	Pic	S, K, A [B, CI, C] D, L, T	None	||Closed|| 250 x 40 x 3 mm	Beginner's all-plastic slide rule marked "HEMMI, Japan, NO P3526"  but manufactured by Hope Slide Rule Mfg Co, Tokyo.  Same as Hope model 51.  (The only known 'Hemmi' example was found in New Zealand.)
Click here for Hemmi Cat II--a table of Hemmi rules which had no model number.
Click here for Frederick Post Slide Rule Cross Reference
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