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发明名称
Systèmes de signalisation à hautes fréquences
摘要
申请公布号
FR49566(E)
申请公布日期
1939.05.11
申请号
FRD49566
申请日期
1938.05.18
申请人
LE MATERIEL TELEPHONIQUE
发明人
分类号
C03B23/26;C03B33/06;C23F1/02;H01P1/16;H01P1/163;H04B3/52
主分类号
C03B23/26
代理机构
代理人
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地址
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