4. Mining or in situ disintegration of hard material
  5. With separation of materials
  6. Separation below surface of earth or water
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Deep sea mining apparatus

Mining or in situ disintegration of hard material – With separation of materials – Separation below surface of earth or water
Patent

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Device for collecting manganese nodules on the ocean floor

Mining or in situ disintegration of hard material – With separation of materials – Separation below surface of earth or water
Patent

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Dredge head with mechanical and pumping action

Mining or in situ disintegration of hard material – With separation of materials – Separation below surface of earth or water
Patent

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Dredging apparatus including suction nozzles

Mining or in situ disintegration of hard material – With separation of materials – Separation below surface of earth or water
Patent

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