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发明名称
Perfectionnements aux systèmes téléphoniques avec lignes partagées
摘要
申请公布号
FR977135(A)
申请公布日期
1951.03.28
申请号
FRD977135
申请日期
1942.07.01
申请人
COMPAGNIE GENERALE D'ELECTRICITE
发明人
LESIGNE HENRI-LOUIS
分类号
H04Q5/20
主分类号
H04Q5/20
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代理人
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