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Title:
Reverberation method and apparatus
United States Patent 2804499
Inventors:
Raymond, Butts Joseph
Application Number:
US35130453A
Publication Date:
08/27/1957
Filing Date:
04/27/1953
Assignee:
Raymond, Butts Joseph
Primary Class:
Other Classes:
84/DIG.26
International Classes:
G10K15/10
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