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经营范围
发明名称
Improvements in or relating to intermediate-frequency thermionic amplifiers
摘要
申请公布号
GB381907(A)
申请公布日期
1932.10.13
申请号
GB19320017305
申请日期
1932.06.18
申请人
N. V. PHILIPS' GLOEILAMPENFABRIEKEN
发明人
分类号
H03H7/01
主分类号
H03H7/01
代理机构
代理人
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