RIGID IN-THE-EAR HEARING AID
United States Patent 3448224
US Patent References:
In-ear hearing aid
- - 2987584

In-the-ear hearing aid
- - 3197576


Inventors:
Giller, Ronald R.
Publication Date:
06/03/1969
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Assignee:
DICTOGRAPH PRODUCTS INC
Primary Class:
381/328
Other Classes:
381/322
International Classes:
H04R25/00; H04R25/02
Foreign References:
DE1115767B




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