DRAFTING PROTRACTOR
United States Patent 3426434
US Patent References:
Combination square
- - 2251208

Geometrical instrument
- - 2631376

Graphical instrument
- - 2867906


Inventors:
Zarling, Harvey R.
Publication Date:
02/11/1969
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Assignee:
Harvey, Zarling R.
Primary Class:
33/424
International Classes:
B43L13/00; B43L13/00




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