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发明名称
Système de signalisation à fréquence ultra-élevée
摘要
申请公布号
FR820500(A)
申请公布日期
1937.11.12
申请号
FRD820500
申请日期
1937.04.10
申请人
LE MATERIEL TELEPHONIQUE
发明人
分类号
H04B3/52
主分类号
H04B3/52
代理机构
代理人
主权项
地址
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