4. Boring or penetrating the earth
  5. Below-ground impact members
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Well case driving anvil

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

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Well jar

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

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Well jar

Boring or penetrating the earth – Below-ground impact members – With releasable means to detachably retain telescoping...
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 jar incorporating elongate resilient vibration snubbers and

Boring or penetrating the earth – Below-ground impact members – Resiliently biased
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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Working tool for a percussion power tool

Boring or penetrating the earth – Below-ground impact members – Telescoping members relatively rotatable
Reexamination Certificate

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