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Mike Frey Slide Rules

Slide Rules and Other Things

Keuffel & Esser 4141 Hudson’s Horsepower Computing Scale on boxwood

Front
Back
Case
Instructions

Clark McCoy’s K&E Catalogs – 4141 information page

Catalog Number: MHF-544, Location: Curio Cabinet < MHF-D10

Mike Frey Slide Rules
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