Measuring – testing – or signalling instruments – Measuring – regulating or indicating instrument – or casing – Electrical property
Patent
1977-04-08
1979-04-03
Holtje, Nelson C.
Measuring, testing, or signalling instruments
Measuring, regulating or indicating instrument, or casing
Electrical property
D10103, D10 78, D1004
Patent
active
D02514842
REFERENCES:
patent: 1779946 (1930-10-01), Nelson
patent: 1965837 (1934-07-01), Herdeg
patent: 2609409 (1952-09-01), Radeke
patent: 2771580 (1956-11-01), Schott
patent: 3646579 (1972-02-01), DiVita
patent: 3893028 (1975-07-01), Febure
patent: 4041380 (1977-08-01), Epstein
CQ-Radio Amateurs Journal, 8/47, p. 7, Ohmmeter.
Holtje Nelson C.
Phifer Earl Cooper
Seltzer Donald M.
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