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公开(公告)号：US3420424A
公开(公告)日：1969-01-07
申请号：US3420424D
申请日：1966-01-10
Applicant: IBM
Inventor： BARBEAU RAYMOND A , DAY KELLY B JR , WEIDENHAMMER JAMES A
CPC classification number: G11B15/671 , F15B21/00 , G06K17/00 , G11B15/61
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