Improvements in thermionic valves,申请号GB19320024087-传众专利搜索

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发明名称	Improvements in thermionic valves
摘要
申请公布号	GB406659(A)	申请公布日期	1934.02.28
申请号	GB19320024087	申请日期	1932.08.29
申请人	JOHN HAPPIAN EDWARDS	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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