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

Clarence A. Rector, Jr.

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Expandable milling head for gas well drilling

Boring or penetrating the earth – With tool shaft detail – Axially telescoping shaft section
Patent

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Pressure balanced valve

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

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Profile ID: LFUS-PAI-P-995926

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