4. Wells
  5. Processes
  6. Operating valve, closure, or changeable restrictor in a well

David L. Parker

Inventor

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Method and apparatus of locking closed a subsurface safety syste

Wells – Processes – Operating valve – closure – or changeable restrictor in a well
Patent

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Push button reversible ratchet wrench

Tools – Wrench – screwdriver – or driver therefor – Handle clutched to head
Patent

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Reversible ratchet wrench

Tools – Wrench – screwdriver – or driver therefor – Handle clutched to head
Patent

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Profile ID: LFUS-PAI-P-1098151

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