Combination protractor and compass

Details Combination protractor and compass Combination protractor and compass

1977-03-07

1978-11-07

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

D10 65, D19 36, D19 38, D1004

Patent

active

D02501775

REFERENCES:
patent: 2007986 (1935-07-01), Sprague
patent: 3465445 (1969-09-01), Fisher
patent: 3497678 (1970-02-01), Warner
patent: 3795053 (1974-03-01), Burke

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