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经营范围
发明名称
Electron discharge device
摘要
申请公布号
US2139757(A)
申请公布日期
1938.12.13
申请号
US19380231060
申请日期
1938.09.21
申请人
N. V. PHILIPS' GLOEILAMPENFABRIEKEN
发明人
KUIPERS MINNE;BOUMEESTER HUIBERT GERARD
分类号
H01J19/34
主分类号
H01J19/34
代理机构
代理人
主权项
地址
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