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发明名称
Système de signalisation
摘要
申请公布号
FR837917(A)
申请公布日期
1939.02.23
申请号
FRD837917
申请日期
1938.05.13
申请人
LIGNES TELEGRAPHIQUES ET TELEPHONIQUES
发明人
分类号
H04Q1/446
主分类号
H04Q1/446
代理机构
代理人
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