Improvements in electron discharge tubes,申请号GB19380014721-传众专利搜索

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发明名称	Improvements in electron discharge tubes
摘要
申请公布号	GB516110(A)	申请公布日期	1939.12.22
申请号	GB19380014721	申请日期	1938.05.17
申请人	HYGRADE SYLVANIA CORPORATION	发明人
分类号	H01J5/12;H01J5/48;H01J5/54;H01J19/02;H01J19/66	主分类号	H01J5/12
代理机构		代理人
主权项
地址

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