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经营范围
发明名称
Improvements in or relating to electric current-converting or mutator tubes
摘要
申请公布号
GB496633(A)
申请公布日期
1938.12.02
申请号
GB19380011475
申请日期
1938.04.14
申请人
N. V. PHILIPS' GLOEILAMPENFABRIEKEN
发明人
分类号
H01J17/54
主分类号
H01J17/54
代理机构
代理人
主权项
地址
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