• Blade bit with improved cleaning

    Patent No. 226619
  • Pipe puncher

    Patent No. 2822260
  • O-ring for sealing cones bearings

    Patent No. 225269
  • Device for hydromechanical directional rotary drilling control

    Patent No. 2811586
  • Mechanical anchor for holding downhole equipment

    Patent No. 221598
  • Hydrodynamic radiator

    Patent No. 221064
  • Spiral reamer-bit

    Patent No. 220830
  • Window mill

    Patent No. 220351