4. Boring or penetrating the earth
  5. Boring without earth removal
  6. Fluid passage to exterior of drive point
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Ram boring apparatus

Boring or penetrating the earth – Boring without earth removal – Fluid passage to exterior of drive point
Patent

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Rotatable drill pipe having an auger on a free end thereof

Boring or penetrating the earth – Boring without earth removal – Fluid passage to exterior of drive point
Patent

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