4. Boring or penetrating the earth
  5. Below-ground impact members
  6. With releasable means to detachably retain telescoping...
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Compensation device for insertion in a drill string for deep-wel

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

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Compression shock absorber device

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

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