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经营范围
发明名称
Electron tube
摘要
申请公布号
GB837758(A)
申请公布日期
1960.06.15
申请号
GB19580039098
申请日期
1958.12.04
申请人
SYLVANIA ELECTRIC PRODUCTS INC.
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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