Cathodes for electron tubes,申请号US19510215240-传众专利搜索

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发明名称	Cathodes for electron tubes
摘要
申请公布号	US2720608(A)	申请公布日期	1955.10.11
申请号	US19510215240	申请日期	1951.03.13
申请人	WELTIS WIHTOL	发明人	WIHTOL WELTIS
分类号	H01J21/36	主分类号	H01J21/36
代理机构		代理人
主权项
地址

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