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公开(公告)号：US3420717A
公开(公告)日：1969-01-07
申请号：US3420717D
申请日：1966-03-28
Applicant: IBM
Inventor： FIELDS DAVIS S JR , MEHL DANIEL L
CPC classification number: C22C18/04 , C22F1/165 , Y10S420/902
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