Electron emitting material,申请号US19280309892-传众专利搜索

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发明名称	Electron emitting material
摘要
申请公布号	US1873730(A)	申请公布日期	1932.08.23
申请号	US19280309892	申请日期	1928.10.02
申请人	ALLGEMEINE ELEKTRICITATZ GESELLSCHAFT	发明人	WIEGAND ERICH
分类号	H01J9/395	主分类号	H01J9/395
代理机构		代理人
主权项
地址

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