Title:
Acoustic apparatus
United States Patent 2869669


Inventors:
James, Leslie Donald
Application Number:
US66919157A
Publication Date:
01/20/1959
Filing Date:
07/01/1957
Assignee:
James, Leslie Donald
Primary Class:
Other Classes:
84/739, 84/740, 84/DIG.4, 984/16
International Classes:
F16L59/08; G10B3/18
View Patent Images:
US Patent References:
2287105Electronic organ1942-06-23
2049616Electrical musical instrument1936-08-04
1547535Sound amplifier1925-07-28
0647147N/A1900-04-10