4. Boring or penetrating the earth
  5. Below-ground impact members
  6. Fluid-operated
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Hydraulic jars for bore hole drilling

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

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Hydraulic rotary-percussive hammer drill

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

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Hydraulic timing device

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

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Hydraulic timing device

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

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Hydraulic well jar

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

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Hydromechanical drilling jar

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

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Hydropneumatic hammer

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

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