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发明名称
Perfectionnements aux systèmes de signalisation électrique
摘要
申请公布号
FR40774(E)
申请公布日期
1932.08.23
申请号
FRD40774
申请日期
1931.06.16
申请人
ASSOCIATED TELEPHONE & TELEGRAPH COMPANY
发明人
分类号
H04L12/18
主分类号
H04L12/18
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代理人
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