XIANNING Jul. 8(www.xnnews.com.cn) Workers on July 3 were grinding anti-EMI magnet ring in the workshop of Tongcheng Hengke Science and Technology Co., Ltd which engages in design, development and manufacture of anti-EMI magnet ring. The investment of the company totals over 10 million yuan, and it can fulfill annual output of 200 million pieces with annual sales of about 10 million yuan.