Index of K&E Catalogs
Cross Reference Index
Index of K&E Collection
Index of K&E Manuals

K&E 4081 Family of Slide Rules

Mahogany Framed 4081-3 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. This rule was produced in 1937.   

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. This rule was produced in 1939.

4081-3 --- 1st Edition. 10" Mahogany with laminated edges. No printing on edge. Serial # 696622. A sales receipt is available for this rule. This rule was produced in 1940.

  4081-3 --- 2nd Edition. 10" Mahogany with laminated edges. No printing on edge. Serial # 184288. This rule was produced in 1946.

4081-3 --- 2nd Edition. 10" Mahogany with laminated edges. No printing on edge. Serial # 195932 This rule was produced in 1947.

4081-3 --- 3nd Edition. 10" Mahogany with laminated edges. No printing on edge. K&E logo on right end. Serial # 306576. This rule was produced in 1948.

4081-3 --- 3nd Edition. 10" Mahogany with laminated edges. No printing on edge. K&E logo on right end. Serial # 402628. This rule was produced in 1949.

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 

• N4081-3 - 10" Mahogany with laminated edges. Serial number 438712.
• N4081-3 - 10" Mahogany with inlaid edges. Serial number 793429.

 

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

• 4081-3 --- 10" Mahogony with inlaid wood edges with printing on edge. Serial # 926572

Scale set #5 (1956-1972)

LL02LL03 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
• 68 1210 -- (4081-3) 10" Mahogany with inlaid wood edges. New model number. Serial # 650852
• 68 1210 -- (4081-3) 10" Mahogany with inlaid wood edges. From the last production run. Serial # 490971

Plastic 4081-3 Slide Rules

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 

• N9081-3 - 10" Plastic. First plastic K&E slide rule. Serial # 45376.

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

• 4181-1 --- 5" All plastic frame. Serial # 023903

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 

• 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 1251 -- (4181-3) 10" Plastic. New model number. Serial # 117649
• 68-1960 -- Projection Demonstration Slide Rule

L LL1 DF [ CF CIF CI C ] D LL3 LL2  
LL0 LL00 r [ n SI Ar ] V DI K 

• Special Variant of unknown use