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Personne àcontacter Ms. vivi
Huanghe, Zhengzhou, Henan
This serise have five kinds of quality : A, B, C, D, E; And each has four size : *3mm, *5mm, *7mm, *0mm; A is used for hard coal bed and rock; B is suitable for wet drilling of the hard coal bed and coal-rock; C is for hard coal and coal-rock; And D for general coal; E for soft coal.