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摘要
申请公布号
US2119124(A)
申请公布日期
1938.05.31
申请号
US19330704807
申请日期
1933.12.30
申请人
RADIO CORPORATION OF AMERICA
发明人
ZIMMERMAN ARTHUR G.
分类号
H04R11/00
主分类号
H04R11/00
代理机构
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