Perfectionnements aux tubes à vide,申请号FRD731947-传众专利搜索

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发明名称	Perfectionnements aux tubes à vide
摘要
申请公布号	FR731947(A)	申请公布日期	1932.09.10
申请号	FRD731947	申请日期	1931.04.22
申请人	ELECSON	发明人
分类号	H01J19/52	主分类号	H01J19/52
代理机构		代理人
主权项
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