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公开(公告)号：US2704902A
公开(公告)日：1955-03-29
申请号：US24257351
申请日：1951-08-18
Applicant: PERFECT CIRCLE CORP
Inventor： TAYLOR CHARLES D
CPC classification number: B41F19/068 , B41F17/00 , B41P2219/11
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