... working environment.Qingzhou JuLong Dredging & Mining Machinery Co., Ltd is a professional manufacturer of dredgers, mineral and sand ... . In recent years,JuLong is improving by adopting new technologies and introducing talents. In addition, JuLong has built good ... Institute, Shijiazhuang Pump Group, and Chongqing Cummins Engine Co., Ltd. Obeying the principle “Quality First, Credit Crucial”, Julong is ...