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Mike Frey Slide Rules

Slide Rules and Other Things

Keuffel & Esser N4041 10″ Mannheim – 549701

Front

Front Gutter

Back

cm Scale

in Scale

Serial Number 549701

Clark McCoy’s K&E Catalogs – 4041 Information page

Catalog Number: MHF-19, Location: MHF-D1

Mike Frey Slide Rules

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