Combined square and protractor

Details Combined square and protractor Combined square and protractor

1975-12-29

1977-08-02

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

D1004

Patent

active

D02452359

REFERENCES:
patent: 74356 (1868-02-01), Hendry
patent: D198935 (1964-08-01), Elkins
patent: D226501 (1973-03-01), Walker
patent: 1118067 (1914-11-01), Smith
patent: 1166512 (1916-01-01), Dannenfelser
patent: 1281790 (1918-10-01), Kirk

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