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发明名称
Duplex telegraph system
摘要
申请公布号
US1826928(A)
申请公布日期
1931.10.13
申请号
US19300488402
申请日期
1930.10.13
申请人
THE WESTERN UNION TELEGRAPH COMPANY
发明人
FOSTER LEE R.
分类号
H04L5/12;H04L5/14
主分类号
H04L5/12
代理机构
代理人
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地址
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