... sea ;Airconditioning-Vessel Standard equipment Qingzhou Yongsheng Dredging Machinery Co., Ltd. was established in 1990. Our company is the ... machinery, sand making machinery, dredging machinery, and mineral processing machinery in Qingzhou. Since 1990, we have taken ... sand washing machinery, sand making machinery, transport ships, stone crushing machinery, large and medium-sized dredging ships, and ...