Cathode comportant de l'oxyde de thorium,申请号FRD995225-传众专利搜索

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发明名称	Cathode comportant de l'oxyde de thorium
摘要
申请公布号	FR995225(A)	申请公布日期	1951.11.29
申请号	FRD995225	申请日期	1949.09.12
申请人	N. V. PHILIPS' GLOEILAMPENFABRIEKEN	发明人
分类号	H01J1/14;H01J9/04;H01J61/073	主分类号	H01J1/14
代理机构		代理人
主权项
地址

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