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发明名称
Telegraph system
摘要
申请公布号
US1749825(A)
申请公布日期
1930.03.11
申请号
US19280280270
申请日期
1928.05.24
申请人
AMERICAN TELEPHONE AND TELEGRAPH COMPANY
发明人
LOYE DONALD P.
分类号
H04L12/04
主分类号
H04L12/04
代理机构
代理人
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地址
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