No Serial Number
Clark McCoy’s K&E Catalogs – 4058 Information page
Catalog Number: MHF-25, Location MHF-D1
Keuffel & Esser 4058C 10″ Mannheim Beginner’s Slide Rule – MHF-25
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-25, Location MHF-D1