| http://www.w3.org/ns/prov#value | - surface drill bit for use in installing the systemUS5363932 *10 May 199315 Nov 1994Smith International, Inc.PDC drag bit with improved hydraulicsUS5379853 *20 Sep 199310 Jan 1995Smith International, Inc.Diamond drag bit cutting elementsUS5890551 *6 Mar 19976 Apr 1999Sandvik AbRock drilling tool including a drill bit having a recess in a front surface thereofUS6062325 *16 Apr 199816 May 2000Camco
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