Jian Qiang Zhang

Chongqing Doyen (Holdings) Co. Ltd. is an investment holding private company based in Chongqing, China. The Chinese company operates in equipment manufacturing and real estate. The company was founded by Siu Yu Lo and Xiao Bo Wang has been the CEO of the company since 2003.

Part of Dima Holdings Co., Ltd., Chengdu Dongyin Information Technology Co., Ltd. designs, develops, and distributes consumable digital information and computer network related software and hardware products. The private company is based in Chengdu, China. Chengdu Dongyin Information Technology Co. was acquired by Dima Holdings Co., Ltd. from Chongqing Doyen (Holdings) Co. Ltd. on December 31, 2004 for $0.31 million.

Daye Nonferrous Metals Group Holdings Ltd. engages in the provision of copper mining and mineral processing services. Its products include iron ore, molybdenum concentrate, copper cathode, sulfuric acid, gold, silver, platinum, palladium, molybdenum, rhenium, selenium, lead, zinc, bismuth, tellurium, and nickel sulfate. The company was founded in 1953 and is headquartered in Huangshi, China.