Pitch and angle square

Details Pitch and angle square Pitch and angle square

1980-06-09

1982-08-10

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

D1004

Patent

active

D02657252

REFERENCES:
patent: 311911 (1885-02-01), Muller
patent: 318984 (1885-06-01), Hedges
patent: 1023242 (1912-04-01), Childs
patent: 1381808 (1921-06-01), Davis
patent: 1807438 (1931-05-01), Ross
patent: 2545112 (1951-03-01), Sheridan
patent: 2582649 (1952-01-01), Olson

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