Title:
In-the-ear hearing aid
United States Patent 3197576
US Patent References:
Electronic intensifying ear-drum
- - 2967913


Inventors:
Martin, Richard T.
Publication Date:
07/27/1965
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Assignee:
DAHLBERG ELECTRONICS
Primary Class:
381/322
Other Classes:
381/328, 381/323
International Classes:
H04R25/02; H04R25/00
Foreign References:
DE1109737B