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摘要
申请公布号
US2537168(A)
申请公布日期
1951.01.09
申请号
US19470770851
申请日期
1947.08.27
申请人
RADIO CORPORATION OF AMERICA
发明人
SPENCER JAMES A.
分类号
H03M7/40
主分类号
H03M7/40
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代理人
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