Electron discharge device,申请号US19310515965-传众专利搜索

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发明名称	Electron discharge device
摘要
申请公布号	US1997196(A)	申请公布日期	1935.04.09
申请号	US19310515965	申请日期	1931.02.16
申请人	BELL TELEPHONE LABORATORIES, INCORPORATED	发明人	MCNALLY JAMES O.
分类号	H01J19/40	主分类号	H01J19/40
代理机构		代理人
主权项
地址

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