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Founde in 1958, Changsha Exploration Machinery Factory( Abbr.Changtan) are a large state-owned enterprise subordinated to Hunan Bureau of Geology and Mineral Exploration and Development, and are a....
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We are Hunan O. E. D hard metal, A professional Chinese manufacturer of tungsten carbide products such as rods, strips, rings, drilling bits, indexable inserts, wear parts, drawing pellets, and....