4. Boring or penetrating the earth
  5. Below-ground impact members
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Drilling jar

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

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Drilling jar latch

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

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Drilling method and measurement-while-drilling apparatus and...

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

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Drilling rigs

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

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Drilling rigs

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

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Drilling shock sub

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

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Drilling tool

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

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Dual spring drill string shock absorber

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

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