Title:
Earphone
United States Patent 2325590

Inventors:
Carlisle, Richard W.
Mastropole, Alfred J.
Publication Date:
08/03/1943
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Assignee:
SONOTONE CORP
Primary Class:
381/328
Other Classes:
381/322, D24/106
International Classes:
H04R11/06; H04R25/02; H04R11/00