Screened thermionic tube,申请号US19280313741-传众专利搜索

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发明名称	Screened thermionic tube
摘要
申请公布号	US1867311(A)	申请公布日期	1932.07.12
申请号	US19280313741	申请日期	1928.10.20
申请人	RADIO CORPORATION OF AMERICA	发明人	FRANKLIN CHARLES SAMUEL
分类号	H01J21/36	主分类号	H01J21/36
代理机构		代理人
主权项
地址

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