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发明名称
Perfectionnements dans les dispositifs de signalisation pour systèmes téléphoniques ou télégraphiques
摘要
申请公布号
FR682803(A)
申请公布日期
1930.06.03
申请号
FRD682803
申请日期
1929.10.05
申请人
LE MATERIEL TELEPHONIQUE
发明人
分类号
H01H47/00
主分类号
H01H47/00
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代理人
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