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公开(公告)号：US2878093A
公开(公告)日：1959-03-17
申请号：US48811555
申请日：1955-02-14
Applicant: UNIV MINNESOTA
Inventor： PETER WARGO
IPC: H01J9/12
CPC classification number: H01J9/125 , H01J2201/32
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