Dispositif émetteur d'électrons,申请号FRD714735-传众专利搜索

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发明名称	Dispositif émetteur d'électrons
摘要
申请公布号	FR714735(A)	申请公布日期	1931.11.19
申请号	FRD714735	申请日期	1931.04.03
申请人	WESTINGHOUSE LAMP COMPANY	发明人
分类号	H01J19/28	主分类号	H01J19/28
代理机构		代理人
主权项
地址

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