Ruler

Measuring – testing – or signalling instruments – Measuring – regulating or indicating instrument – or casing – Geometric

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D1004

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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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