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公开(公告)号：US3377579A
公开(公告)日：1968-04-09
申请号：US60925467
申请日：1967-01-13
Applicant: IBM
Inventor： WISSICK WILLIAM P , LITZ GLADYS M
CPC classification number: G06F13/18 , G06F13/122 , G06F15/78
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