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    • Tri-cone bit cone

      Patent №212334
      pdf 1168579

    • Hydro emitter

      Patent №208539
      pdf 1567119

    • Closed loop rotary-steerable system.

      Patent №2776547
      pdf 357216

    • Expandable hole reamer

      Patent №203929
      pdf 342874

    • Self-orienting, Retrievable Multiple Activation Whipstock

      Patent №199979
      pdf 1550091

    • Threaded connection for drill pipes

      Patent №198398
      pdf 1149907

    • Self-orienting Retrievable Whipstock

      Patent №195113
      pdf 659914

    • Whipstock for sidetracking in a cased well

      Patent №195124
      pdf 671445
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