4. Boring or penetrating the earth
  5. Below-ground impact members
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Offshore platforms

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

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Oil well jar

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

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One-piece drill bit with improved gage design

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

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Optional up-blow, down-blow jar tool

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

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Overburden drilling apparatus having a down-the-hole hammer...

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

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