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K&E 4092-3 Family of Slide Rules
Scale set #1 (1922-1925)
Scale set #2 (1925-1937)
K DF = CF CIF CI C = D L
LL0 A = B S T C = LL3 LL2 LL1- 4092-3 --- 10" Mahogany with laminated edges. All glass cursor. Serial # 261497
- 4092-3 --- 10" Mahogany with laminated edges. All glass cursor with corner ridges. Serial # 396126
- 4092-3 --- 10" Mahogany with laminated edges. Improved metal rimmed cursor. Serial # 523665