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发明名称
THERMIONIC GENERATOR
摘要
申请公布号
CA313094(A)
申请公布日期
1931.07.07
申请号
CAD313094
申请日期
申请人
THE RADIO CORPORATION OF AMERICA
发明人
JOHANNES JACQUES NUMANS
分类号
主分类号
代理机构
代理人
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地址
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