4. Boring or penetrating the earth
  5. Enlargement of existing pilot throughbore requiring...
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Air lift system for large diameter borehole drilling

Boring or penetrating the earth – Enlargement of existing pilot throughbore requiring...
Patent

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Apparatus and method for drilling and reaming a borehole

Boring or penetrating the earth – Enlargement of existing pilot throughbore requiring...
Reexamination Certificate

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Apparatus and method for enlarging underground arcuate bore hole

Boring or penetrating the earth – Enlargement of existing pilot throughbore requiring...
Patent

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Apparatus and method for pilot-tube guided auger boring

Boring or penetrating the earth – Enlargement of existing pilot throughbore requiring...
Reexamination Certificate

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Apparatus and method for selected path drilling

Boring or penetrating the earth – Enlargement of existing pilot throughbore requiring...
Patent

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Apparatus for directional drilling

Boring or penetrating the earth – Enlargement of existing pilot throughbore requiring...
Reexamination Certificate

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Apparatus for drilling hard material

Boring or penetrating the earth – Enlargement of existing pilot throughbore requiring...
Patent

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