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经营范围
发明名称
Electron discharge apparatus
摘要
申请公布号
GB554851(A)
申请公布日期
1943.07.21
申请号
GB19420004173
申请日期
1942.03.28
申请人
WESTERN ELECTRIC COMPANY INCORPORATED
发明人
分类号
H01J21/02;H01J25/52
主分类号
H01J21/02
代理机构
代理人
主权项
地址
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