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发明名称
Tube à vide amplificateur
摘要
申请公布号
FR48852(E)
申请公布日期
1938.09.19
申请号
FRD48852
申请日期
1937.03.17
申请人
发明人
ANDRE) DROUIN (PIERRE,
分类号
H03H11/04
主分类号
H03H11/04
代理机构
代理人
主权项
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