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公开(公告)号：US2897707A
公开(公告)日：1959-08-04
申请号：US50231655
申请日：1955-04-19
Applicant: REIFF & NESTOR COMPANY
Inventor： CURTS JR JOSEPH M , NESTOR DONALD E
CPC classification number: B21C43/04 , B21F23/00 , B23D25/04 , Y10T82/2514 , Y10T82/2521 , Y10T82/2552
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