Level

Details Level Level

1990-11-13

1993-03-09

Douglas, Alan P.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

Patent

active

D03337936

REFERENCES:
patent: D222723 (1971-12-01), Ostrager
patent: 2433480 (1947-12-01), Rendich
patent: 2584917 (1952-02-01), Powell
patent: 2669029 (1954-02-01), Ries
patent: 3435533 (1969-04-01), Whitfield
patent: 3740858 (1973-06-01), Ostrager
patent: 3747221 (1973-07-01), Ostrager
patent: 4164077 (1979-08-01), Thomas
patent: 4715124 (1987-12-01), Harrington

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