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Dur-O-Lite/Dietzgen 3140 “Keen-Point” Drafting Pencil

Eugene Dietzgen Co., Chicago

lead diameter(s) mechanism composition variations production date origin	0.047 in. (1.2 mm) continuous twist advance wooden barrel metal mechanism 16 degree imprints: 5B–B, HB, F, H–9H circa 1963 USA
see also	US Patent 3,097,628 "Mechanical Pencil," 1963 Dur-O-Lite "Keen-Point" Brochure

box of one dozen Dietzgen branded Keen-Point pencils
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Dur-O-Lite “Film-King” Drafting Pencils

Dur-O-Lite, Melrose Park, Illinois, USA

lead diameter(s) mechanism composition variations production date origin	1.2 mm continuous twist advance wooden barrel metal mechanism 4 degree imprints: D-O, D-1, D-2, D-3 circa 1963 USA
see also	US Patent 3,097,628 "Mechanical Pencil," 1963 Dur-O-Lite "Film-King" Brochure