Adjustable drafting tool for making perspective drawings

Details Adjustable drafting tool for making perspective drawings Adjustable drafting tool for making perspective drawings

1990-04-09

1993-09-14

Holtje, Nelson C.

Office supplies; artists and teachers materials

Equipment for writing, drawing, or for fine arts

D19 37, D10 73

Patent

active

D03393763

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patent: 2998654 (1901-09-01), Hancox
patent: 3562919 (1971-02-01), Green
patent: 4453318 (1984-06-01), Hayes

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