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Drilling three cone bit 76mm--660mm
      Promulgator ：fansheng      Time：2017-08-03
215.9mmPDC PDC bit
Large diameter cone bit 311mm--2800mm
Three cone bit 215.9mm
Drilling bit 215.9-660mm
Three cone bit 6 152mm
Inserted cone bit 216mm
Drilling three cone bit 76mm--660mm
Steel tooth bit 445
 
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