Improvements in or relating to electron discharge devices,申请号GB19370004031-传众专利搜索

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发明名称	Improvements in or relating to electron discharge devices
摘要
申请公布号	GB490230(A)	申请公布日期	1938.08.10
申请号	GB19370004031	申请日期	1937.02.10
申请人	FERNSCH AKTIENGESELLSCHAFT	发明人
分类号	H01J43/20	主分类号	H01J43/20
代理机构		代理人
主权项
地址

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