Measuring – testing – or signalling instruments – Measuring – regulating or indicating instrument – or casing – Volume – flow or rate
Patent
1988-10-05
1991-06-25
Holtje, Nelson C.
Measuring, testing, or signalling instruments
Measuring, regulating or indicating instrument, or casing
Volume, flow or rate
Patent
active
D03177262
REFERENCES:
patent: D253812 (1980-01-01), Novak
patent: 2148768 (1939-02-01), Miller
patent: 2656063 (1953-10-01), Kafka
Davis Antoine D.
Holtje Nelson C.
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