Improvements in and relating to thermionic valves,申请号GB19300013087-传众专利搜索

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发明名称	Improvements in and relating to thermionic valves
摘要
申请公布号	GB354182(A)	申请公布日期	1931.07.28
申请号	GB19300013087	申请日期	1930.04.28
申请人	ANDRE EUGENE BLONDEL	发明人
分类号	H01J21/02	主分类号	H01J21/02
代理机构		代理人
主权项
地址

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