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摘要
申请公布号
US2524781(A)
申请公布日期
1950.10.10
申请号
US19450599983
申请日期
1945.06.18
申请人
FEDERAL TELEPHONE AND RADIO CORPORATION
发明人
EPSTEIN JOSEPH
分类号
H03H9/54;H03H9/56;H03H9/60
主分类号
H03H9/54
代理机构
代理人
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