4. Communications, electrical: acoustic wave systems and devices
  5. Wellbore telemetering
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Wired pipe depth measurement system

Communications – electrical: acoustic wave systems and devices – Wellbore telemetering – Through drill string or casing
Reexamination Certificate

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Wireless power and communications cross-bar switch

Communications – electrical: acoustic wave systems and devices – Wellbore telemetering – Through drill string or casing
Reexamination Certificate

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