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经营范围
发明名称
Electromagnetic transducer
摘要
申请公布号
US2286123(A)
申请公布日期
1942.06.09
申请号
US19360082579
申请日期
1936.05.29
申请人
RADIO CORPORATION OF AMERICA
发明人
STEERS WILLIAM F.
分类号
H04R9/02
主分类号
H04R9/02
代理机构
代理人
主权项
地址
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