Measuring – testing – or signalling instruments – Measuring – regulating or indicating instrument – or casing – Volume – flow or rate
Patent
1987-02-25
1990-12-25
Holtje, Nelson C.
Measuring, testing, or signalling instruments
Measuring, regulating or indicating instrument, or casing
Volume, flow or rate
Patent
active
D03131920
REFERENCES:
patent: D214117 (1969-05-01), Greenlee
patent: D264563 (1982-05-01), Leung
patent: 2249309 (1941-07-01), Benko
patent: 2510973 (1950-06-01), Guillemin, Jr.
patent: 3995491 (1976-12-01), Wolfla, II
patent: 4419890 (1983-12-01), Kotama 73379
Bloom Leonard
Davis Antoine D.
Holtje Nelson C.
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