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发明名称
Dispositif pour faire le vide dans les tubes électroniques à vide élevé
摘要
申请公布号
FR838183(A)
申请公布日期
1939.02.28
申请号
FRD838183
申请日期
1938.05.20
申请人
BROWN BOVERI & COMPAGNIE
发明人
分类号
H01J9/38
主分类号
H01J9/38
代理机构
代理人
主权项
地址
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