... Qing Zhou Yong Sheng Dredging Machinery CO.,LTD1.hydraulic cutter suction dredge2.Max dredging depth 8m, discharge distance1- ... area of China ,owns blanking workshop, gold panning machinery processing workshop,mining salt Machinery workshop, anti-corrosion workshop, general ... product debugging and testing center before ex-factory. Our cutter suction dredgers have passed ISO9001 ,CE ,Bureau Veritas,and ...