Mineral sorting, for the sorting of different minerals- MINGDER brand, quartz, calcite, calcium, barite ore etc -Hefei Mingde Optoelectronic Technology CO., LTD www.hefeimd.com/en Mob/whatsapp: 008613966725592 Skype: dianahongsmile Email: dianahong@hefeimd.com Tel: 0086-551-62578095