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K&E 4168 Family of Slide Rules

Scale set:

DF = CF CI C = D L

K A = B ST S = D T

• 9068 ---- 5" Plastic Duplex. Under the DORIC name. (1949-1954) Serial # 5626

• 4168 ---- 5" Plastic Duplex. Under the DORIC name. (1954-1962) Serial # 324798

• 68 1550 - 5" Plastic Duplex with pocket clip. Under the DORIC name. (after 1973) Serial # 049538

• 68 1555 - 5" Plastic Duplex. Under the DORIC name. (1962-1972) Serial # 036940