... prestressed materials and much moresize:4"-48" Danyang Huachang Diamond Tools Manufacturing CO,LTD was established in 1980s,and has ... strictly conform to lS09001-2000 quality control system,and IS014001-2004 environment system,Inspection between processes follows the EN standard ... with one—up technology and equipment,and scientific management system,We are exploring,and innovating We take the business ...