4. Wells
  5. Processes
  6. Assembling well part

Alan J. Marshall

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Percussion bit drill drive collar with retention mechanism...

Boring or penetrating the earth – Bit or bit element – Impact or percussion type
Reexamination Certificate

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Percussion drilling assembly having erosion retarding casing

Boring or penetrating the earth – With tool shaft detail
Reexamination Certificate

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Percussion drilling assembly with annular locking member

Wells – Processes – Assembling well part
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2181835

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