Ruler

Details Ruler Ruler

1979-07-09

1981-06-09

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

D1004

Patent

active

D02594765

REFERENCES:
patent: 83115 (1868-10-01), Wilcox
patent: 2210422 (1940-08-01), Mercer
patent: 3032151 (1962-05-01), Allen
"For Good Measure" Ruler-National Bureau of Standards Special Publication 376-Dec. 1972.

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