Electron discharge devices of the velocity modulation type,申请号GB19460006449-传众专利搜索

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发明名称	Electron discharge devices of the velocity modulation type
摘要
申请公布号	GB625259(A)	申请公布日期	1949.06.24
申请号	GB19460006449	申请日期	1946.03.01
申请人	STANDARD TELEPHONES AND CABLES LIMITED	发明人
分类号	H01J25/24;H01J25/30	主分类号	H01J25/24
代理机构		代理人
主权项
地址

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