Measuring – testing – or signalling instruments – Measuring – regulating or indicating instrument – or casing – Volume – flow or rate
Patent
1989-12-20
1992-06-16
Walsh, Donald P.
Measuring, testing, or signalling instruments
Measuring, regulating or indicating instrument, or casing
Volume, flow or rate
Patent
active
D03270289
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patent: 4974354 (1990-12-01), Hembrook, Jr.
Davis Antoine D.
Gernstein Terry M.
Walsh Donald P.
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