No Serial Number
Clark McCoy’s K&E Catalogs – 4058 Information page
Catalog Number: MHF-34, Location: MHF-D2
Keuffel & Esser 4158 10″ Plastic Mannheim Beginner’s Slide Rule – MHF-34
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-34, Location: MHF-D2