Improvements in cathodes of vacuum electric tube devices,申请号GB19300003414-传众专利搜索

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发明名称	Improvements in cathodes of vacuum electric tube devices
摘要
申请公布号	GB347311(A)	申请公布日期	1931.04.30
申请号	GB19300003414	申请日期	1930.01.31
申请人	ERNEST YEOMAN ROBINSON;ASSOCIATED ELECTRICAL INDUSTRIES LIMITED	发明人
分类号	H01J9/04	主分类号	H01J9/04
代理机构		代理人
主权项
地址

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