Composés métalliques actifs pour tubes à vide,申请号FRD845880-传众专利搜索

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发明名称	Composés métalliques actifs pour tubes à vide
摘要
申请公布号	FR845880(A)	申请公布日期	1939.09.04
申请号	FRD845880	申请日期	1938.11.10
申请人	RADIO CORPORATION OF AMERICA	发明人
分类号	H01J1/14;H01J7/18	主分类号	H01J1/14
代理机构		代理人
主权项
地址

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