Restriction indicator

Details Restriction indicator Restriction indicator

1996-01-11

1997-04-08

Davis, Antoine Duval

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Volume, flow or rate

D23386

Patent

active

D03787443

REFERENCES:
patent: 3939457 (1976-02-01), Nelson
patent: 4020783 (1977-05-01), Anderson et al.
patent: 4031847 (1977-06-01), Sullivan
patent: 4254731 (1981-03-01), Taylor
patent: 4445456 (1984-05-01), Nelson

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