... 四牙轮钻头 crosssection cone bit; four cutter bit; four roller bit; four-roller bit 牙轮钻头 cone rock bit; rifler; rock drill bit; rock roller bit; roller cone bit; roller cutter bit; roller rock bit; roller-cone bit; roller-type bit; rollerbit; rolling cutter bit; rolling cutter rock bit; tooth-wheel bit; toothed roller bit; true-rolling bit 烧结硬质合金钻头 sintered-metal bit ...
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