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Signal translating apparatus
United States Patent 2269284
Inventors:
Olson, Harry F.
Publication Date:
01/06/1942
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Download PDF 2269284
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Assignee:
RCA CORP
Primary Class:
381/342
Other Classes:
367/174, 181/159, 181/144, 381/343, 381/186, 381/402
International Classes:
H04R1/24
;
H04R9/06
;
H04R1/22
;
H04R9/00