4. Boring or penetrating the earth
  5. With above-ground guide for relatively advancing tool
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Derrick

Boring or penetrating the earth – With above-ground guide for relatively advancing tool
Patent

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Device for drilling borehole undercuts

Boring or penetrating the earth – With above-ground guide for relatively advancing tool
Patent

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Device for forming an undercut in a drilled hole

Boring or penetrating the earth – With above-ground guide for relatively advancing tool
Patent

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Device for producing drill holes having an undercut

Boring or penetrating the earth – With above-ground guide for relatively advancing tool
Patent

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Drill rod holder

Boring or penetrating the earth – With above-ground guide for relatively advancing tool
Reexamination Certificate

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Drill rod support, and drill rod support half

Boring or penetrating the earth – With above-ground guide for relatively advancing tool
Reexamination Certificate

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Drilling assembly

Boring or penetrating the earth – With above-ground guide for relatively advancing tool
Patent

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Drilling rig

Boring or penetrating the earth – With above-ground guide for relatively advancing tool
Patent

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