Improvements in electric frequency-changing circuits and multielectrode thermionic valves,申请号GB19380034374-传众专利搜索

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发明名称	Improvements in electric frequency-changing circuits and multielectrode thermionic valves
摘要
申请公布号	GB521762(A)	申请公布日期	1940.05.30
申请号	GB19380034374	申请日期	1938.11.25
申请人	THE M-O VALVE COMPANY LIMITED;ROBERT JAMES BALLANTINE;EMRYS GWYNNE JAMES	发明人
分类号	H01J31/04	主分类号	H01J31/04
代理机构		代理人
主权项
地址

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