QINGDAO DEHONGYUAN INDUSTRY TRADE CO.,LTD QINGDAO DE HONGYUAN INDUSTRY TRADE CO.,LTD is a manufacturer and trader of machinery with the direction of technology research&development. DHY always adheres the objectives of technological innovation, excellence, to provide the most perfect designings, opimal measures, high cost-effective products as our purpose. DHY has three factories:one rubber machinery factory, one shot blasting machinery factory, one parking system factory; DHY is the only ...