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经营范围
发明名称
Lampe thermionique
摘要
申请公布号
FR931742(A)
申请公布日期
1948.03.02
申请号
FRD931742
申请日期
1946.08.01
申请人
THE M-O VALVE COMPANY LIMITED
发明人
分类号
H01J7/18;H01J19/00
主分类号
H01J7/18
代理机构
代理人
主权项
地址
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