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经营范围
发明名称
Electroacoustic transducer
摘要
申请公布号
US2473846(A)
申请公布日期
1949.06.21
申请号
US19470751745
申请日期
1947.06.02
申请人
RADIO CORPORATION OF AMERICA
发明人
BARTON LOY E.
分类号
B06B1/08;H04R15/00
主分类号
B06B1/08
代理机构
代理人
主权项
地址
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