Hearing aid
United States Patent 3229049
US Patent References:
Means for avoiding disturbances in the reception of electric oscillations
- - 2144995
Volume range controlling arrangement employing thermionic amplifiers
- - 2193966
Volume control circuits
- - 2228866
Limiting amplifier
- - 2283241
Control circuits
- - 2285794
Means for avoiding disturbances in the reception of electric oscillations
- - 2144995
Volume range controlling arrangement employing thermionic amplifiers
- - 2193966
Volume control circuits
- - 2228866
Limiting amplifier
- - 2283241
Control circuits
- - 2285794
Inventors:
Hyman, Goldberg
Publication Date:
01/11/1966
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Assignee:
Hyman, Goldberg
Primary Class:
Other Classes:
381/339, 333/14, 330/145, 381/120
International Classes:
H04R25/00
US Patent References:
Foreign References:
| GB798997A |