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公开(公告)号：US2618182A
公开(公告)日：1952-11-18
申请号：US77653647
申请日：1947-09-27
Applicant: PERFECT CIRCLE CORP
Inventor： TEETOR RALPH R
IPC: B21H7/14
CPC classification number: B21H7/14 , Y10S29/023 , Y10S72/703 , Y10T29/4925 , Y10T29/4927 , Y10T29/4994
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