4. Pipe joints or couplings
  5. Particular interface
  6. Tapered

Hughes Tool Company - USA

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Air groove scraper

Boring or penetrating the earth – With mechanical cleaner for bit or cutter element
Patent

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Articulated elevator links for top drive drill rig

Boring or penetrating the earth – Processes
Patent

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Downhole pressure fluctuating feedback system

Boring or penetrating the earth – Natural vibration characteristic of an element of boring...
Patent

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Drill pipe inside blowout preventer

Fluid handling – Line condition change responsive valves – Direct response valves
Patent

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Drilling bit with full release void areas

Boring or penetrating the earth – Bit or bit element – Magnetized or with magnet
Patent

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