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    • Blade bit with improved cleaning

      Patent No. 226619
      pdf 1150805

    • Jar accelerator

      Patent No. 2828968
      pdf 1198005

    • Pipe puncher

      Patent No. 2822260
      pdf 1208630

    • O-ring for sealing cones bearings

      Patent No. 225269
      pdf 1153467

    • Device for hydromechanical directional rotary drilling control

      Patent No. 2811586
      pdf 922033

    • Mechanical anchor for holding downhole equipment

      Patent No. 221598
      pdf 1152577

    • Hydrodynamic radiator

      Patent No. 221064
      pdf 1150902

    • Spiral reamer-bit

      Patent No. 220830
      pdf 1147284
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