Perspective drawing instrument

Details Perspective drawing instrument Perspective drawing instrument

1977-05-02

1980-01-15

Stearman, Joel

Office supplies; artists and teachers materials

Equipment for writing, drawing, or for fine arts

D10 61, D10 65, D1906

Patent

active

D02539560

REFERENCES:
patent: 2667694 (1954-02-01), McQuaid, Sr. et al.
patent: 2895223 (1959-07-01), Fields
patent: 2981004 (1961-04-01), Edlund

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