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发明名称
Microphone
摘要
申请公布号
US2173994(A)
申请公布日期
1939.09.26
申请号
US19370133767
申请日期
1937.03.30
申请人
RADIO CORPORATION OF AMERICA
发明人
ANDERSON LESLIE J.
分类号
H04R23/00
主分类号
H04R23/00
代理机构
代理人
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