4. Boring or penetrating the earth
  5. Below-ground impact members
  6. Resiliently biased
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Downhole connector for use with drill string telemetering system

Boring or penetrating the earth – Below-ground impact members – Resiliently biased
Patent

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Downhole fishing jar mechanism

Boring or penetrating the earth – Below-ground impact members – Resiliently biased
Patent

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