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发明名称
Perfectionnements aux systèmes téléphoniques automatiques ou semiautomatiques
摘要
申请公布号
FR693974(A)
申请公布日期
1930.11.27
申请号
FRD693974
申请日期
1930.04.07
申请人
LE MATERIEL TELEPHONIQUE
发明人
分类号
H04Q3/00
主分类号
H04Q3/00
代理机构
代理人
主权项
地址
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