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发明名称
Perfectionnements aux systèmes téléphoniques automatiques ou semiautomatiques
摘要
申请公布号
FR731952(A)
申请公布日期
1932.09.10
申请号
FRD731952
申请日期
1931.04.23
申请人
LE MATERIEL TELEPHONIQUE
发明人
分类号
H04Q3/58
主分类号
H04Q3/58
代理机构
代理人
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