No Serial Number
Clark McCoy’s K&E Catalogs – 4058 Information page
Catalog Number: MHF-28, Location MHF-D1
Keuffel & Esser 4058W 10″ Mannheim Beginner’s Slide Rule – MHF-28
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-28, Location MHF-D1