Radio direction finder

Details Radio direction finder Radio direction finder

1978-05-03

1980-07-15

Holtje, Nelson C.

Measuring, testing, or signalling instruments

Measuring, regulating or indicating instrument, or casing

Geometric

D1004

Patent

active

D02558793

REFERENCES:
patent: D176453 (1955-12-01), Fowler
patent: D188106 (1960-06-01), Sundberg
patent: D193850 (1962-10-01), Powel
patent: D193931 (1962-10-01), Bagshaw
patent: D213701 (1969-04-01), Leeming
patent: D219741 (1971-01-01), Warren
patent: D224022 (1972-06-01), Warren
patent: D230610 (1974-03-01), Warren
patent: 3115635 (1963-12-01), Leeming
patent: 3469262 (1969-09-01), Frieling
Radio & TV News, Jun. 1957, pp. 42-44, Radio Direction Finder.
Overseas Associated, Inc., Portable Location Plotter.

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