4. Boring or penetrating the earth
  5. With tool drive prime mover or above-ground mechanical...
  6. With installing casing
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Casing hammer assembly for cable tool drilling apparatus

Boring or penetrating the earth – With tool drive prime mover or above-ground mechanical... – With installing casing
Patent

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Collapsible spider for use in supporting casing during upward dr

Boring or penetrating the earth – With tool drive prime mover or above-ground mechanical... – With installing casing
Patent

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