4. Boring or penetrating the earth
  5. Boring without earth removal
  6. Fluid passage to exterior of drive point
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Method and apparatus for drilling a borehole with a borehole...

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

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Method and apparatus for enlarging a bore hole

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

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Method for sinking a borehole in the ground and wet boring tool

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

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Method for steering a ground-drilling machine

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

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