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公开(公告)号：US2821908A
公开(公告)日：1958-02-04
申请号：US56018956
申请日：1956-01-19
Applicant: IBM
Inventor： PORTERFIELD FRED B , JONES WILLIAM B
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公开(公告)号：US2645122A
公开(公告)日：1953-07-14
申请号：US17592450
申请日：1950-07-26
Applicant: IBM
Inventor： PIATT DONALD R , PORTERFIELD FRED B , HICKS CARL D
IPC: G06K5/00
CPC classification number: G06K5/00
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