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经营范围
发明名称
Improvements in or relating to thermionic amplifiers
摘要
申请公布号
GB507884(A)
申请公布日期
1939.06.22
申请号
GB19380034493
申请日期
1938.11.26
申请人
N. V. PHILIPS' GLOEILAMPENFABRIEKEN
发明人
分类号
H03F1/36
主分类号
H03F1/36
代理机构
代理人
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地址
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