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经营范围
发明名称
Electron discharge devices
摘要
申请公布号
GB523281(A)
申请公布日期
1940.07.10
申请号
GB19380037851
申请日期
1938.12.30
申请人
STANDARD TELEPHONES AND CABLES LIMITED
发明人
分类号
H01J25/76
主分类号
H01J25/76
代理机构
代理人
主权项
地址
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