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公开(公告)号：US3304544A
公开(公告)日：1967-02-14
申请号：US24759762
申请日：1962-12-27
Applicant: IBM
Inventor： JOHNSON DONALD D , LIESKOVSKY VLADIMIR M , TIBBETTS WILBUR E
CPC classification number: G11B17/03 , G11B25/043
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