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发明名称
Improvements in thermionic amplifiers
摘要
申请公布号
GB510503(A)
申请公布日期
1939.08.02
申请号
GB19390000075
申请日期
1939.01.02
申请人
N. V. PHILIPS' GLOEILAMPENFABRIEKEN
发明人
分类号
H03F1/50
主分类号
H03F1/50
代理机构
代理人
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