4. Boring or penetrating the earth
  5. With above-ground means to feed tool
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Anchor assembly

Boring or penetrating the earth – With above-ground means to feed tool
Reexamination Certificate

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Apparatus for gripping a down hole tubular for rotation

Boring or penetrating the earth – With above-ground means to feed tool
Patent

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Apparatus for use in driving or withdrawing such earth entering

Boring or penetrating the earth – With above-ground means to feed tool
Patent

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Automated arm for positioning of drilling tools such as an...

Boring or penetrating the earth – With above-ground means to feed tool
Reexamination Certificate

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Automated arm for positioning of drilling tools such as an...

Boring or penetrating the earth – With above-ground means to feed tool
Reexamination Certificate

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Automated arm for positioning of drilling tools such as an...

Boring or penetrating the earth – With above-ground means to feed tool
Reexamination Certificate

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