4. Wells
  5. Valves, closures or changeable restrictors
  6. Fluid operated

Robert P. Appleton

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Apparatus for directional drilling

Boring or penetrating the earth – Means traveling with tool to constrain tool to bore along... – Axially spaced opposed bore wall engaging guides
Patent

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Device for retrieving objects from wells

Wells – With junk retrieving means
Patent

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Mud check valves in drilling apparatus (wells)

Wells – Valves – closures or changeable restrictors – Fluid operated
Patent

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Profile ID: LFUS-PAI-P-411368

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