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发明名称
Système de signalisation téléphonique
摘要
申请公布号
FR822481(A)
申请公布日期
1937.12.30
申请号
FRD822481
申请日期
1937.05.31
申请人
LIGNES TELEGRAPHIQUES ET TELEPHONIQUES
发明人
分类号
H04J1/14
主分类号
H04J1/14
代理机构
代理人
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