Mingder Diamond mineral ores color sorter machine, Double layer mineral stone color sorting machine, mine processing color separator machine---Hefei Mingde Optoelectronic Technology CO., LTD www.hefeimd.com/en Mobile/whatsapp: 008613966725592 Skype: dianahongsmile Tel: 0086-551-62578095 Email: dianahong@hefeimd.com