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公开(公告)号：US2970300A
公开(公告)日：1961-01-31
申请号：US74567758
申请日：1958-06-30
Applicant: IBM
Inventor： WITT VICTOR R , PRENTKY PETER I , DUDEK ERWIN K
IPC: G11B20/20
CPC classification number: G11B20/20
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