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

Donald U. Shaffer

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Ram construction for oil well blow out preventer apparatus

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

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Rotary blowout preventer

Wells – Processes – Placing or shifting well part
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Tubing joint for corrosion protection

Pipe joints or couplings – With casing – lining or protector
Patent

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Profile ID: LFUS-PAI-P-494603

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