4. Wells
  5. Valves, closures or changeable restrictors
  6. Rotated operator
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Valve apparatus

Wells – Valves – closures or changeable restrictors – Rotated operator
Patent

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Valve control apparatus

Wells – Valves – closures or changeable restrictors – Rotated operator
Patent

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Valve operable under oppositely directed pressure differentials

Wells – Valves – closures or changeable restrictors – Rotated operator
Patent

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