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发明名称
Procédé de fabrication d'une cathode à chauffage indirect et cathode obtenue par ce procédé
摘要
申请公布号
FR878950(A)
申请公布日期
1943.02.09
申请号
FRD878950
申请日期
1942.01.30
申请人
N. V. PHILIPS' GLOEILAMPENFABRIEKEN
发明人
分类号
主分类号
代理机构
代理人
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