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经营范围
发明名称
Negative conductance circuits
摘要
申请公布号
US1971919(A)
申请公布日期
1934.08.28
申请号
US19300488147
申请日期
1930.10.11
申请人
RADIO CORPORATION OF AMERICA
发明人
ROBERTS WALTER VAN B.
分类号
H04B3/16
主分类号
H04B3/16
代理机构
代理人
主权项
地址
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