4. Mining or in situ disintegration of hard material
  5. With separation of materials
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Nodule collector

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

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Nodule dredging apparatus and process

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

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Non-motorized gold mining apparatus

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

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