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公开(公告)号：US2856678A
公开(公告)日：1958-10-21
申请号：US46774454
申请日：1954-11-09
Applicant: PERFECT CIRCLE CORP
Inventor： JOHNSON JESSE W
IPC: B25B27/12
CPC classification number: B25B27/12 , Y10T29/536
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