Electron discharge devices,申请号GB19370030380-传众专利搜索

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发明名称	Electron discharge devices
摘要
申请公布号	GB499681(A)	申请公布日期	1939.01.27
申请号	GB19370030380	申请日期	1937.11.05
申请人	STANDARD TELEPHONES AND CABLES LIMITED	发明人
分类号	H01J21/36;H01J25/74	主分类号	H01J21/36
代理机构		代理人
主权项
地址

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