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发明名称
Perfectionnements aux systèmes télégraphiques
摘要
申请公布号
FR732859(A)
申请公布日期
1932.09.27
申请号
FRD732859
申请日期
1932.03.09
申请人
LE MATERIEL TELEPHONIQUE
发明人
分类号
H04L25/03
主分类号
H04L25/03
代理机构
代理人
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