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公开(公告)号：US2566028A
公开(公告)日：1951-08-28
申请号：US78919647
申请日：1947-12-02
Applicant: PERFECT CIRCLE CORP
Inventor： LINN JOSEPH C
IPC: C21D9/40
CPC classification number: C21D9/40 , Y10T29/49279
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