Title:
Coaxial dual-unit electrodynamic loud-speaker
United States Patent 2539672

Inventors:
Olson, Harry F.
John, Preston
Publication Date:
01/30/1951
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Assignee:
RCA CORP
Primary Class:
381/184
Other Classes:
181/144, 381/432, 381/186
International Classes:
H04R1/24; H04R1/22