Bone conduction hearing aid unit
United States Patent 2681389
US Patent References:
/RE22658.html
- - RE22658

Bone conduction unit
- - 2459325

Electromagnetic bone vibrator
- - 2482044


Inventors:
Shaper, Harry B.
Publication Date:
06/15/1954
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Assignee:
DYNA LABS INC
Primary Class:
381/151
Other Classes:
367/132, 381/326, 381/189, 381/380, 381/378
International Classes:
H04R11/00