Thermionic tube,申请号US19300471453-传众专利搜索

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发明名称	Thermionic tube
摘要
申请公布号	US1906458(A)	申请公布日期	1933.05.02
申请号	US19300471453	申请日期	1930.07.29
申请人	RADIO CORPORATION OF AMERICA	发明人	FRANKLIN CHARLES SAMUEL
分类号	H01J19/34	主分类号	H01J19/34
代理机构		代理人
主权项
地址

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