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K&E 4081 Family of Slide Rules
Scale set #1 (1937-1939)
L LL1 DF = CF CIF CI C = D LL3 LL2 LL00 LL0 A = B T ST S = D DI K
- 4081-3 --- 10" Mahogany with laminated edges. No printing on edge. Serial # 591612
Scale set #2 (1939-1947)
L LL1 DF = CF CIF CI C = D LL3 LL2 LL0 LL00 A = B T ST S = D DI K
- 4081-3 --- 1st Edition. 10" Mahogany with laminated edges. No printing on edge. Serial # 689792
- 4081-3 --- 2nd Edition. 10" Mahogany with laminated edges. No printing on edge. Serial # 184288
- 4081-3 --- 3nd Edition. 10" Mahogany with laminated edges. No printing on edge. K&E logo on right end. Serial # 402628
- 4081-3 --- 4th Edition. 10" Mahogany with laminated edges. No printing on edge. K&E logo on right end. Range marks on Log Log scales. Serial # is greater than 405xxx.
L LL1 DF = CF CIF CI C = D LL3 LL2 LL0 LL00 r = n SI Ar = V DI K
Scale set #3 (1947-1954)
LL02 LL03 DF = CF CIF CI C = D LL3 LL2 LL01 K A = B T ST S = D L LL1
Scale set #4 (1954-1956)
LL02 LL03 DF = CF CIF CI C = D LL3 LL2 LL01 L K A = B T ST S = D DI LL1
Scale set #5 (1956-1972)
LL02 LL03 DF = CF CIF CI C = D LL3 LL2 LL01 L K A = B T SRT S = D DI LL1
- 4081-3 --- 10" Mahogany with inlaid wood edges with printing on edge. Serial # 580374
- 4081-5 --- 20" Mahogany with inlaid wood edges with printing on edge. Serial # 378820
- 4181-1 --- 5" Plastic. Serial # 008924
- 4181-1 --- (68 1282 1950s style packaging) 5" Plastic. Serial # 101743. 4181-1 model number on rule.
- 4181-1 --- (68 1282 1960s style packaging) 5" Plastic. Serial # 122917. No model number on rule.
- 4181-3 --- 10" Plastic. Serial # 250683
- 68 1210 -- (4081-3) 10" Mahogany with inlaid wood edges. New model number. Serial # 650852
- 68 1251 -- (4181-3) 10" Plastic. New model number. Serial # 117649
- 68-1960 -- Projection Demonstration Slide Rule