Cathode for electron discharge devices,申请号US19400315375-传众专利搜索

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发明名称	Cathode for electron discharge devices
摘要
申请公布号	US2239416(A)	申请公布日期	1941.04.22
申请号	US19400315375	申请日期	1940.01.24
申请人	ELECTRIC & MUSICAL INDUSTRIES LIMITED	发明人	EHRENBERG WERNER
分类号	H01J1/20;H01J3/02;H01J35/14	主分类号	H01J1/20
代理机构		代理人
主权项
地址

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