Measuring – testing – or signalling instruments – Measuring – regulating or indicating instrument – or casing – Volume – flow or rate
Patent
1991-07-05
1993-07-20
Douglas, Alan P.
Measuring, testing, or signalling instruments
Measuring, regulating or indicating instrument, or casing
Volume, flow or rate
Patent
active
D03375412
REFERENCES:
patent: 1292792 (1919-01-01), Jaques, Jr.
Davis Antoine D.
Douglas Alan P.
Evergreen Industries Inc.
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