Acoustical ceiling construction
United States Patent 2009512

Inventors:
Offutt, James S.
Strom, Carl S.
Publication Date:
07/30/1935
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Assignee:
Offutt, James S.
Strom, Carl S.
Primary Class:
52/145
Other Classes:
52/506.090, 411/918, 52/781.300, 52/407.300, 411/340
International Classes:
E04B9/26; E04B9/22