Measuring – testing – or signalling instruments – Measuring – regulating or indicating instrument – or casing – Electrical property
Patent
1980-05-21
1983-03-08
Holtje, Nelson C.
Measuring, testing, or signalling instruments
Measuring, regulating or indicating instrument, or casing
Electrical property
D1004
Patent
active
D02681722
REFERENCES:
patent: D204937 (1966-05-01), Morrison
patent: D224319 (1972-07-01), Sylvester
patent: D238562 (1976-01-01), Sylvester
patent: 3428888 (1969-02-01), Nolte
Design News-5/2/73-Impact Analyzer at top-right.
Chirkov Viktor V.
Lyapunov Alexandr V.
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