4. Boring or penetrating the earth
  5. Below-ground impact members
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Valve assembly for a downhole to remove bore hole subsidence

Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Patent

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Valve used in a hydraulic drilling jar

Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Patent

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Variable hydraulic resistor jarring tool

Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Patent

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Variable orifice sleeve valve hydraulic jar tool

Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Patent

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Venting and sealing system for down-hole drills

Boring or penetrating the earth – Below-ground impact members – Fluid-operated
Patent

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Vertically adjustable pipe racking apparatus

Boring or penetrating the earth – Below-ground impact members – With releasable means to detachably retain telescoping...
Patent

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Vibration isolator

Boring or penetrating the earth – Below-ground impact members – With releasable means to detachably retain telescoping...
Patent

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