HYDRAULIC LOUDSPEAKERS
United States Patent 3456755
US Patent References:
Phonographic sound box
- - 1416582
Sound signaling device for dense sound-propagating mediums
- - 1451422
Acoustic transformer
- - 1730528
Metallic diaphragm for electrodynamic loudspeakers
- - 3093207
Acoustic-wave apparatus
- - 3347335
Phonographic sound box
- - 1416582
Sound signaling device for dense sound-propagating mediums
- - 1451422
Acoustic transformer
- - 1730528
Metallic diaphragm for electrodynamic loudspeakers
- - 3093207
Acoustic-wave apparatus
- - 3347335
Inventors:
Walker, John
Publication Date:
07/22/1969
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Export Citation:
Assignee:
John, Walker
Primary Class:
Other Classes:
381/165, 381/430, 381/182, 381/398
International Classes:
H04R1/42; H04R7/12; H04R9/06; H04R1/00; H04R7/00; H04R9/00; G10K13/00; H04R7/16
US Patent References:
Foreign References:
| DE1089415B | ||||
| FR1146757A |