Improvements relating to thermionic valves or electron discharge tubes,申请号GB19320009813-传众专利搜索

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发明名称	Improvements relating to thermionic valves or electron discharge tubes
摘要
申请公布号	GB381491(A)	申请公布日期	1932.10.06
申请号	GB19320009813	申请日期	1932.04.05
申请人	N. V. PHILIPS' GLOEILAMPENFABRIEKEN	发明人
分类号	H01J19/44	主分类号	H01J19/44
代理机构		代理人
主权项
地址

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