Protractor

Details Protractor Protractor

1981-10-20

1983-12-06

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

D1004

Patent

active

D02716674

REFERENCES:
patent: D129583 (1941-09-01), Grant
patent: D137459 (1944-03-01), Colmery
patent: D157458 (1950-02-01), Zagray
patent: D267932 (1983-02-01), Sidrak
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
patent: 2735182 (1956-02-01), Kalberer
patent: 3579841 (1971-05-01), Peterson

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