B21F 3/06

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Patent/Pub #TitleFiling DateIssue/Publication DatePatent Owner
2021/0323,047 COILING MACHINE, METHOD FOR MANUFACTURING COIL SPRING, AND COIL SPRINGJun 28, 21Oct 21, 21NHK SPRING CO., LTD.
2019/0039,118 Coil Spring Winding Apparatus and Method of Winding A Coil SpringFeb 03, 16Feb 07, 19Not available
2017/0348,759 COILING MACHINE AND MANUFACTURING METHOD OF COIL SPRINGAug 25, 17Dec 07, 17NHK SPRING CO., LTD.
2015/0273,565 HOT FORMED COILING MACHINEMar 27, 14Oct 01, 15DAE WON KANG UP CO., LTD.
2014/0311,204 SPRING WINDING MACHINE WITH AN ADJUSTABLE CUTTING DEVICEApr 14, 14Oct 23, 14WAFIOS AKTIENGESELLSCHAFT
2013/0087,106 METHOD FOR PRODUCING STEAM GENERATOR TUBESMay 09, 11Apr 11, 13SIEMENS AKTIENGESELLSCHAFT