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发明名称
Perfectionnements aux tubes à décharge électronique
摘要
申请公布号
FR733207(A)
申请公布日期
1932.10.03
申请号
FRD733207
申请日期
1931.05.12
申请人
LE MATERIEL TELEPHONIQUE
发明人
分类号
H01J19/34
主分类号
H01J19/34
代理机构
代理人
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