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公开(公告)号：US3225990A
公开(公告)日：1965-12-28
申请号：US24675762
申请日：1962-12-24
Applicant: IBM
Inventor： BARBEAU RAYMOND A , FAGUT JOSEPH H , JOHNSON JR DWIGHT O , PEARSON EUGENE S
IPC: G11B15/50
CPC classification number: G11B15/50
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