Measuring – testing – or signalling instruments – Measuring – regulating or indicating instrument – or casing – Dial gauge or meter
Patent
1976-06-24
1978-08-15
Holtje, Nelson C.
Measuring, testing, or signalling instruments
Measuring, regulating or indicating instrument, or casing
Dial gauge or meter
D10 75, D1004
Patent
active
D02489295
REFERENCES:
patent: D139694 (1944-12-01), Oelrich
patent: D181743 (1957-12-01), Molloy
patent: D223001 (1972-02-01), Bonanno
patent: D242232 (1976-11-01), Martin
Popular Science, 3/76, p. 152, "Power Meter" at top.
Holtje Nelson C.
Watt Watchers, Inc.
Zimmerman Harris
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