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公开(公告)号：US3483495A
公开(公告)日：1969-12-09
申请号：US3483495D
申请日：1968-01-15
Applicant: IBM
Inventor： CLARK KENDALL , TURRIS FRANK L DE , KAPER RONALD G
CPC classification number: H01F19/08 , Y10T29/49073
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