Hubei Three-Ring Wall Materials Co. Ltd. - Sino-German manufacturer of gypsum fibre boards. With company profile and technical specifications. www.geocities.com/yingcheng_gypsum/index.html
Xiaogan Chengda Commerce Co. Ltd. - Deals in machinery, electronics, chemicals, building materials, and light industrial and agricultural products. With pictures and descriptions of each item. www.hb-chengda.com
