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公开(公告)号：US2580768A
公开(公告)日：1952-01-01
申请号：US76860047
申请日：1947-08-14
Applicant: IBM
Inventor： HAMILTON FRANCIS E , SEEBER JR ROBERT R , PRENTICE RALPH W
IPC: G06F7/46
CPC classification number: G06F7/468
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