4. Boring or penetrating the earth
  5. Boring a submerged formation

Per Espen Edvardsen

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Arrangement for the removal of cuttings and gas arising from...

Wells – Submerged well – Means removably connected to permanent well structure
Reexamination Certificate

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Methods and system for processing of drilling fluid

Boring or penetrating the earth – Boring a submerged formation
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Seal for a drill string

Wells – Above ground apparatus – With seal for reciprocating member
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2791556

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