4. Boring or penetrating the earth
  5. With above-ground means for handling drilling fluid or cutting
  6. Fluid or cuttings directing or receiving means engaging bore...
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Auger and retaining shell assembly

Boring or penetrating the earth – With above-ground means for handling drilling fluid or cutting – Fluid or cuttings directing or receiving means engaging bore...
Patent

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Auger and sweeper assembly

Boring or penetrating the earth – With above-ground means for handling drilling fluid or cutting – Fluid or cuttings directing or receiving means engaging bore...
Patent

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Auxiliary equipment for use with drilling apparatus

Boring or penetrating the earth – With above-ground means for handling drilling fluid or cutting – Fluid or cuttings directing or receiving means engaging bore...
Reexamination Certificate

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