Electron tube with electromagnetic grid control,申请号US19310549686-传众专利搜索

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发明名称	Electron tube with electromagnetic grid control
摘要
申请公布号	US1931737(A)	申请公布日期	1933.10.24
申请号	US19310549686	申请日期	1931.07.09
申请人	ISIDOR GOLDBERG	发明人	PARISI MICHAEL
分类号	H01J21/18	主分类号	H01J21/18
代理机构		代理人
主权项
地址

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