4. Handling: hand and hoist-line implements
  5. Grapple
  6. Well type

Vernon T. Richey

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Apparatus for reducing annular back pressure near the drill bit

Boring or penetrating the earth – With tool shaft detail – Helix or helically arranged structure
Patent

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Apparatus for use in maintaining a well pipe centered within a w

Wells – Guide for device or conduit – On sucker or pump rod
Patent

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Releasable drill string stabilizer

Boring or penetrating the earth – With tool shaft detail – Helix or helically arranged structure
Patent

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Releasable drill string stabilizer

Boring or penetrating the earth – With tool shaft detail – Shaft carried guide or protector
Patent

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Releasable drill string stabilizer

Cutlery
Patent

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Profile ID: LFUS-PAI-P-548236

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