Electroacoustical apparatus
United States Patent 2228886

Inventors:
Olson, Harry F.
Publication Date:
01/14/1941
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Assignee:
RCA CORP
Primary Class:
181/158
Other Classes:
381/338, 367/152, 381/357, 381/178
International Classes:
H04R1/22; H04R1/34; H04R1/32