Keuffel & Esser 4058 10″ Mannheim Student’s / Beginner’s Slide Rule Celluloid cursor4058 10″ Mannheim Student’s Slide Rule – MHF-214058 10″ Mannheim Student’s Slide Rule – MHF-224058 10″ Mannheim Student’s Slide Rule – MHF-5904058D 10″ Mannheim Beginner’s Slide Rule – MHF-549Glass cursor with wood blocks4058C 10″ Mannheim Beginner’s Slide Rule – MHF-234058C 10″ Mannheim Beginner’s Slide Rule – MHF-244058C 10″ Mannheim Beginner’s Slide Rule – MHF-254058W 10″ Mannheim Beginner’s Slide Rule – MHF-26Glass cursor with formed metal frame4058W 10″ Mannheim Beginner’s Slide Rule – MHF-274058W 10″ Mannheim Beginner’s Slide Rule – MHF-284058W 10″ Mannheim Beginner’s Slide Rule – MHF-589Glass cursor with formed metal frame – Long Slide4058W 10″ Mannheim Beginner’s Slide Rule – MHF-29Plastic Cursor4058W 10″ Mannheim Beginner’s Slide Rule – MHF-30N4058W 10″ Mannheim Beginner’s Slide Rule – MHF-31