4. Boring or penetrating the earth
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Percussion drill head

Boring or penetrating the earth – Processes – Boring horizontal bores
Reexamination Certificate

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Pilot tube system and attachment mechanism for auger boring...

Boring or penetrating the earth – Processes – Boring horizontal bores
Reexamination Certificate

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Process and tool for laying underground collector mains for liqu

Boring or penetrating the earth – Processes – Boring horizontal bores
Patent

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Process for establishing a clear horizontal borehole in a subter

Boring or penetrating the earth – Processes – Boring horizontal bores
Patent

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Process for recovering methane gas from subterranean coalseams

Boring or penetrating the earth – Processes – Boring horizontal bores
Patent

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