4. Mining or in situ disintegration of hard material
  5. Tunnel recovery of fluid material
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Water treatment and heating in spent shale oil retort

Mining or in situ disintegration of hard material – Tunnel recovery of fluid material
Patent

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Withdrawal of gases and liquids from an in situ oil shale retort

Mining or in situ disintegration of hard material – Tunnel recovery of fluid material
Patent

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