B21F 3/12

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Patent/Pub #TitleFiling DateIssue/Publication DatePatent Owner
9718114 Wire forming apparatusSep 16, 14Aug 01, 17KABUSHIKI KAISHA ITAYA SEISAKU SHO
9273742 Coil springs with complex coil configurations, assemblies with coil springs, and related methodsJan 27, 14Mar 01, 16BAL SEAL ENGINEERING, INC.
8371147 Apparatus and method for the manufacture of a spring unitJan 09, 12Feb 12, 13Trickett, David, Truckett, David,
6948348 Method of arranging coils in a spring coil assemblyJan 05, 04Sep 27, 05SLEEPYHEAD MANUFACTURING CO. LTD.
6758078 Spring coil assembly and system for making the sameJun 20, 01Jul 06, 04SLEEPYHEAD MANUFACTURING CO. LTD.
5950473 Coil spring forming and conveying assemblyJan 09, 98Sep 14, 99SLEEPYHEAD MANUFACTURING CO. LTD.
4964204 Method for making a garter-type axially-resilient coil springSep 05, 89Oct 23, 90BAL SEAL ENGINEERING CO., INC., Balsells; Joan C., BALSELLS, PETER J.,
4876781 Method of making a garter-type axially resilient coiled springNov 07, 88Oct 31, 89BAL SEAL ENGINEERING CO., INC., Balsells; Joan C., BALSELLS, PETER J.,
4750253 Method and apparatus for producing a flat spiral link assemblyDec 22, 86Jun 14, 88Herrmann Wangner GmbH & Co KG
4622839 Apparatus for manufacturing spring unitDec 30, 85Nov 18, 86France Bed Co., Ltd.