Liquid level gauge

Details Liquid level gauge Liquid level gauge

1991-04-17

1993-05-25

Douglas, Alan P.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Volume, flow or rate

Patent

active

D03358291

REFERENCES:
patent: D223776 (1972-06-01), Gruett
patent: D283804 (1986-05-01), Waters
patent: D292072 (1987-09-01), Bertani
patent: D293655 (1988-01-01), Phillips et al.
patent: 2643546 (1953-06-01), Boehm
patent: 2664645 (1954-01-01), Qualman
patent: 2707396 (1955-05-01), Dupure
patent: 3150524 (1964-09-01), Arens
patent: 3835708 (1974-09-01), Gruett
patent: 3886796 (1975-06-01), Gruett
patent: 4116065 (1978-09-01), Jensen

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