4. Handling: hand and hoist-line implements
  5. Hook, hoistline, or grab type
  6. Locking device

David B. Mason

Inventor

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Internal blow out preventer ball and seat

Fluid handling – With casing – support – protector or static constructional... – Jacketed
Reexamination Certificate

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Iron roughneck

Tools – Wrench – screwdriver – or driver therefor – Machine
Reexamination Certificate

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Non-seize material attachment for a drill slip system

Wells – Processes – Placing or shifting well part
Reexamination Certificate

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Non-seize material attachment for a drill slip system

Wells – Processes – Placing or shifting well part
Reexamination Certificate

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Safety elevator

Handling: hand and hoist-line implements – Hook – hoistline – or grab type – Locking device
Patent

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Profile ID: LFUS-PAI-P-727800

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