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Contact Supplierwe are offering dredging machine. pressair dredges are used to excavate sand and gravel from underwater deposits. advantages are high solids production, little investment cost, little wear and maintenance, reliability, energy efficiency, low environmental impact. quality of building material begins at it's source. machines available from 250 - 700 tonshour. as well applicable for dam and river maintenance, underwater foundations (bridges, offshore windtowers), wet mining.