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公开(公告)号：US2815470A
公开(公告)日：1957-12-03
申请号：US50052655
申请日：1955-04-11
Applicant: HIVAC LTD
Inventor： DENNIS LODGE , HENRY THOMPSON LEONARD , SANDHAM STOREY JAMES
CPC classification number: H03K3/37 , H01J17/48 , H01J2893/007
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