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经营范围
发明名称
GRID ELECTRODE
摘要
申请公布号
CA422257(A)
申请公布日期
1944.08.22
申请号
CAD422257
申请日期
申请人
RADIO CORPORATION OF AMERICA
发明人
OTTO H. SCHADE
分类号
主分类号
代理机构
代理人
主权项
地址
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