Measuring – testing – or signalling instruments – Measuring – regulating or indicating instrument – or casing – Geometric
Patent
1977-09-16
1980-04-08
Holtje, Nelson C.
Measuring, testing, or signalling instruments
Measuring, regulating or indicating instrument, or casing
Geometric
D1004
Patent
active
D02546540
REFERENCES:
patent: D176453 (1955-12-01), Fowler
patent: D188106 (1960-06-01), Sundberg
patent: D193850 (1962-10-01), Powell
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, 6/1957, pp. 42-44, Radio Direction Finder.
Overseas Associated, Inc., Portable Location Plotter.
Holtje Nelson C.
Plevy Arthur L.
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