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公开(公告)号：US2590863A
公开(公告)日：1952-04-01
申请号：US22424451
申请日：1951-05-02
Applicant: US ARMY
Inventor： HAROLD JACOBS , MARTIN JACK R
CPC classification number: H01J17/40 , H01J17/38 , H01J2893/0065
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