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发明名称
Systèmes de signalisation à fréquence ultra élevée
摘要
申请公布号
FR843966(A)
申请公布日期
1939.07.13
申请号
FRD843966
申请日期
1938.03.22
申请人
LE MATERIEL TELEPHONIQUE
发明人
分类号
H01J19/80;H01J21/36;H03B5/18;H03D9/06;H03F3/54
主分类号
H01J19/80
代理机构
代理人
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地址
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