Protractor

Details Protractor Protractor

1990-06-01

1992-07-28

Walsh, Donald P.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

Patent

active

D03282562

REFERENCES:
patent: D284089 (1986-06-01), Hines
patent: 923313 (1909-06-01), Anderson
patent: 1082377 (1913-12-01), Ward
patent: 4233741 (1980-11-01), Bisset
patent: 4491724 (1985-01-01), Murray
patent: 4731933 (1988-03-01), Cope

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