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公开(公告)号：US3221431A
公开(公告)日：1965-12-07
申请号：US16320761
申请日：1961-12-29
Applicant: IBM
Inventor： STAUFFER FRED S , DONELSON CLARIS L
IPC: G06K17/00
CPC classification number: G06K17/0019 , G06K17/00
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