Qingdao Leader international Trade and Industry Co., Ltd. is the joint venture of Toppower Group and Green Holding Group. We are the sales company/key window for our group factories, which are leading manufacture/supplier for petroleum equipment, Oil tools, OCTG, oilfiled chemicals etc., with API/GOST/ISO certificates. As core supplier for CNPC, Sinopec, Schlumberger, Haliburton, Baker Hughes etc., for years. We can supply best quality, competitive price, prompt shipment...