Ruler

Details Ruler Ruler

1992-01-27

1993-10-12

Douglas, Alan P.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

Patent

active

D03401952

REFERENCES:
patent: D78898 (1929-07-01), Rice
patent: D211283 (1968-06-01), Hassenfeld
patent: 1249132 (1917-12-01), Leavens
patent: 2562348 (1951-07-01), Bowser, Jr.

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