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发明名称
Telegraph system
摘要
申请公布号
US1979026(A)
申请公布日期
1934.10.30
申请号
US19320598209
申请日期
1932.03.11
申请人
BELL TELEPHONE LABORATORIES, INCORPORATED
发明人
DOWD ANDREW D.
分类号
H04L25/04;H04L25/20
主分类号
H04L25/04
代理机构
代理人
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