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经营范围
发明名称
Rueckgekoppelte Roehrenschaltung
摘要
申请公布号
DE643934(C)
申请公布日期
1937.04.21
申请号
DE1932R086470D
申请日期
1932.11.24
申请人
RADIO CORPORATION OF AMERICA
发明人
分类号
H03B7/04;H03D11/02
主分类号
H03B7/04
代理机构
代理人
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