Hong Tao Tan

Yima Coal Industry Group Co Ltd is a state-owned manufacturing enterprise. The company mainly manufactures & distributes coals. It was founded in 1958 and is headquartered in Henan, CN.

Chongqing Doyen (Holdings) Co. Ltd. is an investment holding 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 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.

Henan Golden Dragon Precise Copper Tube, Inc. engages in the manufacture and sale of copper pipes and tubes. Its business activities consist of the following: manufacture of non-ferrous metals; research, development, production and sale of new energy materials; hotel management; and mining business. Its products include high precision copper tubes, high efficient inner-grooved tubes, copper tubes with plastic, copper alloy tubes, capillary tubes, and tube fittings. The company was founded in 1987 and is headquartered in Xinxiang, China.