Improvements relating to electron discharge tubes or thermionic valves,申请号GB19300013306-传众专利搜索

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发明名称	Improvements relating to electron discharge tubes or thermionic valves
摘要
申请公布号	GB338480(A)	申请公布日期	1930.11.20
申请号	GB19300013306	申请日期	1930.04.30
申请人	N.V. PHILIPS' GLOEILAMPENFABRIEKEN	发明人
分类号	H01J5/50;H01J19/66	主分类号	H01J5/50
代理机构		代理人
主权项
地址

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