Improvements relating to thermionic valves or electron discharge tubes,申请号GB19290014531-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	GB329152(A)	申请公布日期	1930.05.15
申请号	GB19290014531	申请日期	1929.05.09
申请人	N.V. PHILIPS' GLOEILAMPENFABRIEKEN	发明人
分类号	H01J7/18	主分类号	H01J7/18
代理机构		代理人
主权项
地址

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