Ruler

Details Ruler Ruler

1991-07-03

1993-03-23

Douglas, Alan P.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

D10 64

Patent

active

D03341461

REFERENCES:
patent: D70173 (1926-05-01), Holtz
patent: D146342 (1947-02-01), White
patent: D157218 (1950-02-01), Vanderbrook
patent: D197415 (1964-01-01), Mello
patent: D261612 (1981-11-01), Henkels
patent: 360545 (1887-04-01), Wagner
patent: 641756 (1900-01-01), Bach

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