4. Mining or in situ disintegration of hard material
  5. Processes
  6. Stabilizing underground structure

Robert Harold Trent

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Longwall mining of trona with prefracturing to prevent slabbing

Mining or in situ disintegration of hard material – Processes – Stabilizing underground structure
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Method and apparatus for hydrocarbon subterranean recovery

Boring or penetrating the earth – Processes – Boring curved or redirected bores
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Profile ID: LFUS-PAI-P-1361890

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