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公开(公告)号：US2992954A
公开(公告)日：1961-07-18
申请号：US63343357
申请日：1957-01-10
Applicant: NCR CO
Inventor： NELSON BYRON W , MARCEY STEPHEN D
CPC classification number: H01H11/00 , H01B1/00 , H01B3/004 , Y10T29/49011 , Y10T156/109 , Y10T428/31511
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