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STEERABLE DRILLING SYSTEM

  • US 20060249287A1
  • Filed: 05/02/2006
  • Published: 11/09/2006
  • Est. Priority Date: 05/05/2005
  • Status: Abandoned Application
First Claim
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1. A steerable drilling system comprising a bias unit operable by means of a control valve arrangement, the control valve arrangement comprising a rotary valve having a control shaft the angular position of which is controlled by a motor.

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