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K&E 4071-3 Family of Slide Rules
Scale set #1 (1939-1956)
DF = CF CIF CI C = D L K A = B T ST S = D DI 4071-3 --- 10" Mahogany with laminated edges and metal rimmed cursor. Serial # 643425. 9071-3 --- 10" Plastic body with metal rimmed cursor. Serial # 014147. 4071-3 --- 10" Mahogany with inlaid edges, K&E logo, and metal rimmed cursor. Serial # 840195.
DF = CF CIF CI C = D L K A = B T ST S = D DI
Scale set #2 (1956-1962)
DF = CF CIF CI C = D L K A = B T SRT S = D DI 4071-3 --- 10" Mahogany with inlaid edges and metal rimmed cursor. Serial # 186094. 68 1497 -- 10" Mahogany with inlaid edges and metal rimmed cursor. Serial # 540603.
DF = CF CIF CI C = D L K A = B T SRT S = D DI