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K&E 4139 Family of Slide Rules

Scale set #1:

L DF = CF CIF CI C = D 2pi
LC A = B T ST S = D DI

• 4139 --- 10" Mahogany with laminated edges. Serial # 293347

Scale set #2:

L DF = CF CIF CI C = D 2pi
LC A = B T SRT S = D DI

• 4139 --- 10" Mahogany with inlaid edges. Serial # 200346