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发明名称
Perfectionnements à l'utilisation des tubes électroniques à écran
摘要
申请公布号
FR679349(A)
申请公布日期
1930.04.11
申请号
FRD679349
申请日期
1928.12.10
申请人
SOCIETE DES ETABLISSEMENTS DUCRETET
发明人
分类号
H03G5/08
主分类号
H03G5/08
代理机构
代理人
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地址
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