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公开(公告)号：US2932759A
公开(公告)日：1960-04-12
申请号：US44477354
申请日：1954-07-21
Applicant: UNIV MINNESOTA
Inventor： SHEPHERD WILLIAM G
IPC: H01J19/38
CPC classification number: H01J19/38 , H01J2893/0017
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