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公开(公告)号：US2984827A
公开(公告)日：1961-05-16
申请号：US85896459
申请日：1959-12-11
Applicant: IBM
Inventor： TRAPNELL JR FREDERICK M , HILLIARD JR HUGH C
IPC: G11B5/004
CPC classification number: G11B5/004
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