No Serial Number
Clark McCoy’s K&E Catalogs – 4058 Information page
Catalog Number: MHF-31, Location MHF-D1
Keuffel & Esser N4058W 10″ Mannheim Beginner’s Slide Rule – MHF-31
Slide Rules and Other Things
Slide Rules and Other Things
No Serial Number
Clark McCoy’s K&E Catalogs – 4058 Information page
Catalog Number: MHF-31, Location MHF-D1