4. Boring or penetrating the earth
  5. Means traveling with tool to constrain tool to bore along...
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Earth boring device

Boring or penetrating the earth – Means traveling with tool to constrain tool to bore along...
Patent

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Electromagnetic drilling apparatus

Boring or penetrating the earth – Means traveling with tool to constrain tool to bore along...
Patent

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Equipment for a drilling fitting comprising an element to be act

Boring or penetrating the earth – Means traveling with tool to constrain tool to bore along...
Patent

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Extension and retraction mechanism for subsurface drilling equip

Boring or penetrating the earth – Means traveling with tool to constrain tool to bore along... – Axially spaced opposed bore wall engaging guides
Patent

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