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公开(公告)号：US2895489A
公开(公告)日：1959-07-21
申请号：US50186055
申请日：1955-04-18
Applicant: PERFECT CIRCLE CORP
Inventor： FOUST EUGENE A
CPC classification number: C23G3/021 , B21C47/003 , B65H54/40 , B65H59/38
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