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公开(公告)号：US2859868A
公开(公告)日：1958-11-11
申请号：US58670656
申请日：1956-05-23
Applicant: IBM
Inventor： JAWORSKI CHARLES J , LA DUE JAMES J
IPC: G03B21/32 , G11B23/027
CPC classification number: G11B23/027 , G03B21/323
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