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    Patent №2791940
  • Circulating sub for operations with MWD

    Patent №215418
  • Circulating sub for operations with MWD

    Patent №215417
  • Tri-cone bit cone

    Patent №212334
  • Hydro emitter

    Patent №208539
  • Closed loop rotary-steerable system.

    Patent №2776547
  • Expandable hole reamer

    Patent №203929
  • Self-orienting, Retrievable Multiple Activation Whipstock

    Patent №199979