Combined protractor, triangle, compass and beam compass

Details Combined protractor, triangle, compass and beam compass Combined protractor, triangle, compass and beam compass

1977-03-21

1979-08-14

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

D10 65, D1004

Patent

active

D02526158

REFERENCES:
patent: D194242 (1962-12-01), Robbins
patent: 843459 (1907-02-01), Humes
patent: 932281 (1909-08-01), Humes
patent: 1121303 (1914-12-01), Smith
patent: 2178796 (1939-11-01), Kormann
patent: 2292094 (1942-08-01), Thomas
patent: 2495558 (1950-01-01), Walton
patent: 3321835 (1967-05-01), Curtis

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