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K&E 68 1550 (4168) --- 5" Plastic Duplex Slide Rule

From the collection of Clark McCoy

This rule is unusal in that it came as a boxed set. The instruction manual with it is a late version that is generic for all slide rules copyrighted in 1973. Notice that there is no model number on the rule, just the word "Doric".

Front side with case

Back side

Box

Front cover of manual