DVT Spring ke moetsi ea thehiloeng ka 2006, o toropong ea Ningbo. Setsi sa rona se koahela lisekoere-mithara tse fetang 1,000 le basebetsi ba 50 ho pota. Re ipapisitse le likarolo tsa selemo le litempe, joalo ka compression spring, torsion spring, wireforming parts, battery contact etc, North America, Europe, Southeast Aisa ke limmaraka tsa rona tse kholo. Re rometse selemo sa rona linaheng tse fetang 20 ho fihlela joale.