Improvements in and relating to thermionic valves,申请号GB19310003595-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	GB372393(A)	申请公布日期	1932.05.04
申请号	GB19310003595	申请日期	1931.02.04
申请人	PAUL FREEDMAN	发明人
分类号	H01J19/42	主分类号	H01J19/42
代理机构		代理人
主权项
地址

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