Electron discharge tube and circuits,申请号US19400320592-传众专利搜索

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发明名称	Electron discharge tube and circuits
摘要
申请公布号	US2239560(A)	申请公布日期	1941.04.22
申请号	US19400320592	申请日期	1940.02.24
申请人	RADIO CORPORATION OF AMERICA	发明人	HEROLD EDWARD W.
分类号	H03D7/02	主分类号	H03D7/02
代理机构		代理人
主权项
地址

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