No Serial Number
Clark McCoy’s K&E Catalogs – 4058 Information page
Catalog Number: MHF-35, Location MHF-D2
Keuffel & Esser 68 1892 10″ Plastic Mannheim Beginner’s Slide Rule – MHF-35
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-35, Location MHF-D2