Perfectionnements aux lampes à faisceau électronique,申请号FRD821199-传众专利搜索

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发明名称	Perfectionnements aux lampes à faisceau électronique
摘要
申请公布号	FR821199(A)	申请公布日期	1937.11.29
申请号	FRD821199	申请日期	1937.04.28
申请人	MARCONI'S WIRELESS TELEGRAPH COMPANY LIMITED	发明人
分类号	H01J31/04	主分类号	H01J31/04
代理机构		代理人
主权项
地址

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