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经营范围
发明名称
TUNABLE RADIO FREQUENCY CIRCUIT
摘要
申请公布号
CA381042(A)
申请公布日期
1939.04.25
申请号
CAD381042
申请日期
申请人
RADIO CORPORATION OF AMERICA
发明人
WALTER VAN BRAAM ROBERTS
分类号
主分类号
代理机构
代理人
主权项
地址
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