Pole level indicator

Details Pole level indicator Pole level indicator

1993-04-02

1994-09-06

Douglas, Alan P.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

Patent

active

D03502937

REFERENCES:
patent: D318243 (1991-07-01), Piskula
patent: 2194995 (1940-03-01), Bergquist
patent: 2469795 (1949-05-01), Sproul
patent: 3138878 (1964-06-01), Mehlman
patent: 3673696 (1972-07-01), Wasson
patent: 3673697 (1972-07-01), Wasson
patent: 4591250 (1986-05-01), Woodruff
patent: 4726009 (1988-02-01), Issac
patent: 5207004 (1993-05-01), Gructzmacher
patent: 5253425 (1993-10-01), Wozniak

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