Measuring – testing – or signalling instruments – Measuring – regulating or indicating instrument – or casing – Volume – flow or rate
Patent
1993-02-11
1994-08-02
Douglas, Alan P.
Measuring, testing, or signalling instruments
Measuring, regulating or indicating instrument, or casing
Volume, flow or rate
D10 31
Patent
active
D03492532
REFERENCES:
patent: 4371945 (1983-02-01), Karr et al.
patent: 4700874 (1987-10-01), Mock et al.
patent: 4726687 (1988-02-01), Gander
Davis Antoine D.
Douglas Alan P.
Smith Hugh E.
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