4. Seal for a joint or juncture
  5. Seal between relatively movable parts
  6. Relatively rotatable radially extending sealing face member

Gary R. Schaeper

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Annular blowout preventer

Valves and valve actuation – Blow-out preventers
Patent

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Annular blowout preventer

Valves and valve actuation – Blow-out preventers
Patent

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Annular blowout preventer

Valves and valve actuation – Blow-out preventers – Deformable annulus
Patent

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Annular blowout preventer with upper and lower spherical sealing

Valves and valve actuation – Blow-out preventers
Patent

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Annular blowout preventer with upper and lower spherical sealing

Valves and valve actuation – Blow-out preventers
Patent

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