LandOfFree - US Patents - Listing for Boring or penetrating the earth,Below-ground impact members,Fluid-operated

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Transmission sleeve

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

Reexamination Certificate

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Transmission sleeve for a down hole hammer

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

Patent

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Transmission sleeve for a down hole hammer

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

Patent

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Two way hydraulic drilling jar

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

Patent

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Underground piercing tool

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

Reexamination Certificate

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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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Well jar accelerator with expansion chamber

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

Patent

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Well jar having a time delay section

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

Patent

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Well tool and method of use therefor

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

Patent

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