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lead diameter mechanism composition variations production date origin |
2 mm head twist lock clutch machined plastic barrel, molded plastic cap, metal mechanism none 1940s USA |
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| see also |
US Patent 2,298,555 "Mechanical Lead Pencil," 1939 TEC Refill Leads |
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lead diameter mechanism composition variations production date origin |
2 mm head twist lock clutch machined plastic barrel, molded plastic cap, metal mechanism none 1950s USA |
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| special features | interchangeable lead indicator rings | ||
| see also |
Vemco TEC Photographic Retouching Leadholder Defiance Sales Corp. catalog, 1955, p 251 |
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lead diameter mechanism composition variations production date origin |
2 mm head twist lock clutch machined plastic barrel, metal mechanism none 1950s USA |
||
| special features | interchangeable lead indicator rings | ||
| see also | Defiance Sales Corp. catalog, 1955, p 251 |
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lead diameter mechanism composition variations production date origin |
2 mm mid-mounted double twist lock clutch machined plastic barrel, metal mechanism none 1950s USA |
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| special features |
unusual double ended adaptation of the head-twist mechanism interchangeable lead indicator rings |
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| see also |
Vemco TEC Photographic Retouching Set Gordon Draftsmen's Supply Co. catalog, 1948, p 51 Defiance Sales Corp. catalog, 1955, p 251 |
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