Electron discharge device,申请号US19320589939-传众专利搜索

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发明名称	Electron discharge device
摘要
申请公布号	US2117246(A)	申请公布日期	1938.05.10
申请号	US19320589939	申请日期	1932.01.30
申请人	THE WESTERN UNION TELEGRAPH COMPANY	发明人	HAGLUND HAKON H.
分类号	H01J17/04;H01J17/54	主分类号	H01J17/04
代理机构		代理人
主权项
地址

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