Ruler

Details Ruler Ruler

1979-10-05

1981-07-28

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

D1004

Patent

active

D02600056

REFERENCES:
patent: D29328 (1898-09-01), Carver
patent: D29832 (1898-12-01), Walker
patent: 83115 (1868-10-01), Wilcox
patent: D187493 (1960-03-01), Zuckerman
patent: D207794 (1967-05-01), Cherrington
patent: D252615 (1979-08-01), Lopez
patent: 1009214 (1911-11-01), Backstrom
patent: 1870655 (1932-08-01), Schur
patent: 3343265 (1967-09-01), Puerta
Post Cat., 19th Edition, 7/1/50, p. 102, "Circ-L-Scale," Template No. 2976 at center-right.

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