4. Boring or penetrating the earth
  5. Below-ground impact members
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Earth auger and method for driving piles and the like by means o

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

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Earth drilling lubricated hydraulic shock absorber and method

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

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Electro-mechanical drilling jar

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

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Enclosed jar tool

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

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Exhaust valve and bit assembly for down-hole percussive drills

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

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