Keuffel & Esser 4041 10″ Mannheim – 196998


This slide rule belonged to Theo Corbin Lewis, my grandfather. I believe it was used when he attended Bliss Electrical School, Washington, D.C. in the late 1920’s.

Front Gutter
cm Scale
Manual – Copyright 1927

Serial Number 196998

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

Catalog Number: MHF-539, Location: Roll Top Desk