Protractor

Details Protractor Protractor

1981-01-26

1983-02-15

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

D10 62, D1004

Patent

active

D02679329

REFERENCES:
patent: 621177 (1899-03-01), Sykes
patent: 665316 (1901-01-01), Fay
patent: 1264633 (1918-04-01), Gibson
patent: 1961500 (1934-06-01), Larson
patent: 2011282 (1935-08-01), Hochman

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