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发明名称
Perfectionnements aux dispositifs de changement de fréquence à tubes électroniques à plusieurs électrodes
摘要
申请公布号
FR35683(E)
申请公布日期
1930.03.27
申请号
FRD35683
申请日期
1928.05.26
申请人
发明人
THEBAULT GEORGES
分类号
H03D7/10
主分类号
H03D7/10
代理机构
代理人
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