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发明名称
Method and apparatus for focusing charged particles
摘要
申请公布号
US2658150(A)
申请公布日期
1953.11.03
申请号
US19480063274
申请日期
1948.12.03
申请人
BACKUS JOHN G;BERNARD PETERS
发明人
BACKUS JOHN G.;PETERS BERNARD
分类号
H01J49/30
主分类号
H01J49/30
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代理人
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