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经营范围
发明名称
An electron gun for generating a hollow beam
摘要
申请公布号
GB940765(A)
申请公布日期
1963.11.06
申请号
GB19600035078
申请日期
1960.10.13
申请人
TESLA
发明人
分类号
H01J3/02
主分类号
H01J3/02
代理机构
代理人
主权项
地址
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