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公开(公告)号：CH528742A
公开(公告)日：1972-09-30
申请号：CH909671
申请日：1971-06-22
Applicant: IBM
Inventor： JOHN KARL ALSTAD , JOHN DENTON JR ARMITAGE , GEOFFREY BATE
IPC: G02F1/09 , G11B11/105 , G02F1/18 , G11B11/10
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