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公开(公告)号：US3168309A
公开(公告)日：1965-02-02
申请号：US16320861
申请日：1961-12-29
Applicant: IBM
Inventor： SCHOPP ROBERT E , CHOU ALBERT S , SPURRIER CHESTER E
IPC: G06K13/06
CPC classification number: G06K13/06
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