Improvements relating to electron discharge tubes,申请号GB19300028469-传众专利搜索

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发明名称	Improvements relating to electron discharge tubes
摘要
申请公布号	GB357774(A)	申请公布日期	1931.10.01
申请号	GB19300028469	申请日期	1930.09.23
申请人	N. V. PHILIPS' GLOEILAMPENFABRIEKEN	发明人
分类号	H01J17/04	主分类号	H01J17/04
代理机构		代理人
主权项
地址

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