Electron emission material,申请号US19280293801-传众专利搜索

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发明名称	Electron emission material
摘要
申请公布号	US1865437(A)	申请公布日期	1932.07.05
申请号	US19280293801	申请日期	1928.07.18
申请人	WESTINGHOUSE LAMP COMPANY	发明人	FREDENBURGH MARK N.
分类号	H01J9/04	主分类号	H01J9/04
代理机构		代理人
主权项
地址

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