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Personne àcontacter Ms. shirley
Yuelu street south lushan road, Changsha, Hunan
tungsten carbide buttons :for button bits , medium and low pressure DTH bits, high pressure DTH bits, roller cone bits , hobbing cutter bits, and mining roller, road milling machine. all grades such as ***** types and size such asZQ.ZZ.ZD.ZP.ZS ect.