Reverberation loud-speaker assembly
United States Patent 2853145
US Patent References:
/0415499.html
- - 0415499

/0516360.html
- - 0516360

/0707441.html
- - 0707441

Acoustic transformer
- - 1730531

Sound amplification
- - 1768226


Inventors:
Martin, Daniel W.
Publication Date:
09/23/1958
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Assignee:
BALDWIN PIANO COMPANY
Primary Class:
181/163
Other Classes:
333/146, 381/342, 381/65, 381/186, 333/143
International Classes:
G10K15/10; G10K15/08
US Patent References:
1812998Resonance attachment for sound reproducing devices
1932459Loud speaker
1988250Loud speaker and method of propagating sound
2375004Training apparatus
2437445Sound reverberating device
2548235Transformerless audio output system
2768235Reverberation devices
Foreign References:
GB382868A