Ruler

Details Ruler Ruler

1991-07-03

1993-01-12

Douglas, Alan P.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

D10 64

Patent

active

D03324125

REFERENCES:
patent: D25609 (1896-06-01), Davis
patent: D59462 (1921-10-01), Draper
patent: D224440 (1972-07-01), Daughtry
patent: 314507 (1885-03-01), Yongz
patent: 419268 (1890-01-01), Low
patent: 422033 (1890-02-01), Nisley

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