4. Valves and valve actuation
  5. Blow-out preventers
  6. Radial reciprocating ram

David McWhorter

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Bi-directional sealing ram

Valves and valve actuation – Blow-out preventers – Radial reciprocating ram
Patent

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Variable size coil tubing gripping elements

Wells – Processes – Placing or shifting well part
Reexamination Certificate

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Profile ID: LFUS-PAI-P-1151417

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