Protractor

Details Protractor Protractor

1981-12-10

1984-06-26

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

D10 62

Patent

active

D02744112

REFERENCES:
patent: D129583 (1941-09-01), Grant
patent: D267932 (1983-02-01), Sidrak
patent: 665316 (1901-01-01), Fay
patent: 679261 (1901-07-01), Johnson
patent: 1264633 (1918-04-01), Gibson

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