Measuring – testing – or signalling instruments – Measuring – regulating or indicating instrument – or casing – Electrical property
Patent
1978-02-21
1980-09-16
Holtje, Nelson C.
Measuring, testing, or signalling instruments
Measuring, regulating or indicating instrument, or casing
Electrical property
D10 46, D1004
Patent
active
D02568950
REFERENCES:
patent: D204937 (1966-05-01), Morrison
patent: D221001 (1971-06-01), Sylvester
patent: D238562 (1976-01-01), Sylvester
patent: 2495707 (1950-01-01), Doschek
patent: 2787784 (1957-04-01), Meryman
patent: 3609543 (1971-09-01), Whitmore
Electronic Industries-6/46-p. 76-"Metalsorter", at bottom left.
Holtje Nelson C.
Ray David L.
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