The main manufacturers of coal testing equipment are Changsha and Hebi, the owner of the Hebi so not cold, then only choose Changsha, Changsha manufacturers are many, a few larger is Changsha Kaiyuan, Changsha Sande, Changsha Youxin, Changsha Ruixiang. One of the largest is now Changsha Kaiyuan, the production of equipment is more comprehensive, Changsha Sande is more sales staff manufacturers, Changsha Ruixiang is more advanced manufacturers, technology is more distinctive. Just searched the space of coal quality testing equipment in Baidu, the space of coal quality equipment in Changsha has hi.baidu.com/xb12350
The others seem to be Hebi's now