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公开(公告)号：US3221418A
公开(公告)日：1965-12-07
申请号：US28298163
申请日：1963-05-24
Applicant: IBM
Inventor： HOERNES GERHARD E , LONG HARVEY S , MALEY GERALD A
IPC: G09B7/08
CPC classification number: G09B7/08
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