DVT Spring ke moetsi ea thehiloeng ka 2006, o toropong ea Ningbo.Setsi sa rona se na le lisekoere-mithara tse fetang 1,000 le basebetsi ba 50 ho pota.Re hloahloa ka 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.