4. Communications: electrical
  5. Wellbore telemetering or control
  6. Selective control of subsurface equipment
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Remote switch position determination using constant current sign

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

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Rotary downlink system

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

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