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经营范围
发明名称
Selective frequency changer
摘要
申请公布号
US2708237(A)
申请公布日期
1955.05.10
申请号
US19510236227
申请日期
1951.07.11
申请人
RADIO CORPORATION
发明人
ROBERTS WALTER VAN B.
分类号
H03H9/62
主分类号
H03H9/62
代理机构
代理人
主权项
地址
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