Improvements in electron discharge devices,申请号GB19300028898-传众专利搜索

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发明名称	Improvements in electron discharge devices
摘要
申请公布号	GB363430(A)	申请公布日期	1931.12.24
申请号	GB19300028898	申请日期	1930.09.26
申请人	REVELATION PATENTS HOLDING COMPANY	发明人
分类号	H01J21/20	主分类号	H01J21/20
代理机构		代理人
主权项
地址

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