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发明名称
Electronic transducer
摘要
申请公布号
US2491391(A)
申请公布日期
1949.12.13
申请号
US19460716297
申请日期
1946.12.14
申请人
RADIO CORPORATION OF AMERICA
发明人
JR. GEORGE M. ROSE,
分类号
H01J21/08;H04R23/00
主分类号
H01J21/08
代理机构
代理人
主权项
地址
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