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K&E 4091-3 Family of Slide Rules

1933-1934 Scale set:

L LL1 DF = CF CIF C = D LL3 LL2  
L00 A = B K CI = T S2 S1 

• 4091-3 --- 10" Mahogany with laminated edges and all glass cursor. No printing on edge except serial number. Serial # 453902
• 4091-3 --- 10" Mahogany with laminated edges and metal rimmed cursor. No printing on edge except serial number. Serial # 460179

1934-1936 Scale set:

L LL1 DF = CF CIF CI C = D LL3 LL2  
L00 A = B K CI = T S2 S1 

• 4091-3 --- 10" Mahogany with laminated edges and metal rimmed cursor. No printing on edge except serial number. Serial #538852