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经营范围
发明名称
Perfectionnements apportés aux tubes électriques à vide
摘要
申请公布号
FR740603(A)
申请公布日期
1933.01.30
申请号
FRD740603
申请日期
1932.07.29
申请人
N. V. PHILIPS' GLOEILAMPENFABRIEKEN
发明人
分类号
H01J19/42
主分类号
H01J19/42
代理机构
代理人
主权项
地址
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