4. Boring or penetrating the earth
  5. With tool drive prime mover or above-ground mechanical...
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Earth boring apparatus

Boring or penetrating the earth – With tool drive prime mover or above-ground mechanical... – With diversely operated shafts extending into bore
Patent

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Earth drilling device

Boring or penetrating the earth – With tool drive prime mover or above-ground mechanical...
Reexamination Certificate

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Electric horizontal directional drilling machine system

Boring or penetrating the earth – With tool drive prime mover or above-ground mechanical...
Reexamination Certificate

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Environmentally friendly horizontal boring system

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

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Equipment for continuous hole drilling in soil

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

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Erosion resistent drilling head assembly

Boring or penetrating the earth – With tool drive prime mover or above-ground mechanical... – Rotary drive for a relatively advancing tool
Reexamination Certificate

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Expansible drive core

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

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