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发明名称
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摘要
申请公布号
US2669706(A)
申请公布日期
1954.02.16
申请号
US19500160951
申请日期
1950.05.09
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
GRAY FRANK
分类号
H04L7/04
主分类号
H04L7/04
代理机构
代理人
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