Level

Details Level Level

1990-06-27

1993-08-17

Douglas, Alan P.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

Patent

active

D03384144

REFERENCES:
patent: D223635 (1972-05-01), Lew
patent: D252500 (1979-07-01), Mason
patent: 2308088 (1943-01-01), Liverman

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