How many companies are there in Kaisheng Group?

20. These 20 enterprises are: Kaisheng Yingshi Materials (Hainan) Co., Ltd., China Building Materials Bengbu Glass Industry Design and Research Institute Co., Ltd., Kaisheng Yingshi Materials (Huangshan) Co., Ltd., Kaisheng Heavy Industry Co., Ltd.-Kaisheng Yingshi Materials (Taihu) Co., Ltd., China Building Materials Light Industry Automation Research Institute Co., Ltd., China Building Materials Tongliao Silica Sand Industry Co., Ltd., Chengdu China Optoelectronic Technology Co., Ltd., Co., Ltd. Chengdu Sinobuilding Materials Optoelectronic Materials Co., Ltd. (Optoelectronic Materials Division), Sino-Singapore Group Engineering Consulting Co., Ltd. (Optoelectronic Display Division), Anhui Tianzhu Green Energy Technology Co., Ltd. (New Materials Division), Anhui Kaisheng Basic Materials Technology Co., Ltd., Sinobuilding Materials Jiaxing Glass (Heilongjiang) Co., Ltd., Sinobuilding Materials (Bengbu) Optoelectronic Materials Co., Ltd., Sinobuilding Materials (Neijiang) Glass Hi-Tech Co., Ltd.