Electrical sound reproducing device
United States Patent 3178512
US Patent References:
Loud-speaker
- - 1726533
Bone conduction hearing device
- - 2127468
Body contacting inertia reaction electromechanical transducing devices
- - 2832842
Audio-electric translating device
- - 2957053
Amplifier system for magnetic recorder-reproducer
- - 3015695
Loud-speaker
- - 1726533
Bone conduction hearing device
- - 2127468
Body contacting inertia reaction electromechanical transducing devices
- - 2832842
Audio-electric translating device
- - 2957053
Amplifier system for magnetic recorder-reproducer
- - 3015695
Inventors:
Ashworth, William J.
Publication Date:
04/13/1965
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Export Citation:
Assignee:
ARTNELL COMPANY
Primary Class:
Other Classes:
381/152
International Classes:
H04R1/02; H04R9/06; H04R23/02; H04R9/00; H04R23/00
US Patent References:
| 3030455 | Bone-conduction all-in-one transistor amplifier hearing aid |