Title:
Acoustic apparatus
United States Patent 2869669
US Patent References:
/0647147.html
- - 0647147

Sound amplifier
- - 1547535

Electrical musical instrument
- - 2049616

Electronic organ
- - 2287105


Inventors:
James, Leslie Donald
Publication Date:
01/20/1959
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Assignee:
James, Leslie Donald
Primary Class:
181/143
Other Classes:
84/DIG.004, 84/739, 984/16, 84/740
International Classes:
F16L59/08; G10B3/18; G10B3/00