4. Boring or penetrating the earth
  5. Processes
  6. Boring curved or redirected bores

Robert J. Hopley

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Borehole guide and method of boring interpenetrating holes

Boring or penetrating the earth – Processes – Boring curved or redirected bores
Patent

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Mining method

Mining or in situ disintegration of hard material – Processes – Stabilizing underground structure
Patent

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Profile ID: LFUS-PAI-P-1185024

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