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发明名称
Perfectionnements aux systèmes de télécommunication électrique
摘要
申请公布号
FR684921(A)
申请公布日期
1930.07.02
申请号
FRD684921
申请日期
1929.02.15
申请人
发明人
VIARD GEORGES
分类号
H04B3/20
主分类号
H04B3/20
代理机构
代理人
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