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K&E 4150-1 Family of Slide Rules

Scale set:

DF = CF CI C = D L

• 4150-1 --- 5" Plastic Mannheim. Serial # 021588. Packaged as a 68 1791 however the rule is marked 4150-1.
• 4150-1 --- 5" Plastic Mannheim. Serial # 093035. Has advertising on rear.