Square

Details Square Square

1976-09-07

1978-05-16

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

D1004

Patent

active

D02478773

REFERENCES:
patent: 91892 (1969-07-01), Winterbottom
patent: 413946 (1889-10-01), Iseminger
patent: 640510 (1900-01-01), Vandevort
patent: 1369038 (1921-02-01), Maconnell
Simmons Hardware Co. Cat. 1890, p. 320, square at lower left #C 1392.

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