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发明名称
Telegraph exchange system
摘要
申请公布号
US2228890(A)
申请公布日期
1941.01.14
申请号
US19370156684
申请日期
1937.07.31
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
SINGER FRED J.
分类号
H04L12/04
主分类号
H04L12/04
代理机构
代理人
主权项
地址
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