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公开(公告)号：US3503272A
公开(公告)日：1970-03-31
申请号：US3503272D
申请日：1968-05-27
Applicant: IBM
Inventor： COCHRAN THOMAS J , FORMICHELLI JOSEPH C
IPC: B23Q3/18
CPC classification number: B23Q3/18 , Y10T74/18752
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