4. Communications: electrical
  5. Wellbore telemetering or control
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Sequential hydraulic control system for use in a...

Communications: electrical – Wellbore telemetering or control – Selective control of subsurface equipment
Reexamination Certificate

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Short hop communication link for downhole MWD system

Communications: electrical – Wellbore telemetering or control – Selective control of subsurface equipment
Patent

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Supplemental referencing techniques in borehole surveying

Communications: electrical – Wellbore telemetering or control – Selective control of subsurface equipment
Reexamination Certificate

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Surface acoustic wave pipe identification system

Communications: electrical – Wellbore telemetering or control – Selective control of subsurface equipment
Patent

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System and method for indirectly determining inclination at the

Communications: electrical – Wellbore telemetering or control – Selective control of subsurface equipment
Patent

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System and method of communicating between a plurality of comple

Communications: electrical – Wellbore telemetering or control – Selective control of subsurface equipment
Patent

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System for drilling deivated boreholes

Communications: electrical – Wellbore telemetering or control – Selective control of subsurface equipment
Patent

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System for drilling deviated boreholes

Communications: electrical – Wellbore telemetering or control – Selective control of subsurface equipment
Patent

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System for managing borehole information

Communications: electrical – Wellbore telemetering or control – Selective control of subsurface equipment
Reexamination Certificate

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