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发明名称
Coaxial dual-unit electrodynamic loud-speaker
摘要
申请公布号
US2539672(A)
申请公布日期
1951.01.30
申请号
US19490090464
申请日期
1949.04.29
申请人
RADIO CORPORATION OF AMERICA
发明人
OLSON HARRY F.;PRESTON JOHN
分类号
H04R1/24
主分类号
H04R1/24
代理机构
代理人
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