Improvements in or relating to thermionic valves,申请号GB19280028904-传众专利搜索

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发明名称	Improvements in or relating to thermionic valves
摘要
申请公布号	GB323742(A)	申请公布日期	1930.01.08
申请号	GB19280028904	申请日期	1928.10.08
申请人	CHARLES SAMUEL FRANKLIN;JOHN GLOVER ROBB;LEONARD JOHN GOLDING	发明人
分类号	H01J19/36	主分类号	H01J19/36
代理机构		代理人
主权项
地址

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