Improvements in vacuum electric tube devices,申请号GB19280034791-传众专利搜索

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发明名称	Improvements in vacuum electric tube devices
摘要
申请公布号	GB325030(A)	申请公布日期	1930.02.13
申请号	GB19280034791	申请日期	1928.11.26
申请人	ERNEST YEOMAN ROBINSON;METROPOLITAN-VICKERS ELECTRICAL COMPANY, LIMITED	发明人
分类号	H01J1/20	主分类号	H01J1/20
代理机构		代理人
主权项
地址

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