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发明名称
Perfectionnements aux cathodes à chauffage indirect pour lampes électroniques
摘要
申请公布号
FR750248(A)
申请公布日期
1933.08.07
申请号
FRD750248
申请日期
1933.02.07
申请人
ALLGEMEINE ELEKTRICITATS-GESELLSCHAFT
发明人
分类号
H01J1/22
主分类号
H01J1/22
代理机构
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