Automatic tone control circuit
United States Patent 2073504

Inventors:
Charles, Travis
Publication Date:
03/09/1937
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Assignee:
RCA CORP
Primary Class:
455/233.100
Other Classes:
333/17.100, 333/213, 455/267, 455/249.100, 333/28T
International Classes:
H03G3/26; H03G3/22