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发明名称
Duplex telegraph system
摘要
申请公布号
US1773371(A)
申请公布日期
1930.08.19
申请号
US19280316019
申请日期
1928.10.30
申请人
THE WESTERN UNION TELEGRAPH COMPANY
发明人
MILNOR JOSEPH W.;CANNON WILLIAM D.
分类号
H04L5/14
主分类号
H04L5/14
代理机构
代理人
主权项
地址
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