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公开(公告)号：US3449756A
公开(公告)日：1969-06-10
申请号：US3449756D
申请日：1965-08-10
Applicant: IBM
Inventor： BARBEAU RAYMOND A , BRADFORD REX C , FRAIM NORMAN R , LOCKETT DONALD E
CPC classification number: G11B5/00
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