4. Boring or penetrating the earth
  5. With below-ground tool drive prime mover
  6. Below-ground storage of motivating energy

Robert G. Knight

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Drilling apparatus

Boring or penetrating the earth – With below-ground tool drive prime mover – Below-ground storage of motivating energy
Patent

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Pick holding arrangements

Mining or in situ disintegration of hard material – Miscellaneous
Patent

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Pick holding arrangements

Mining or in situ disintegration of hard material – Miscellaneous
Patent

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Profile ID: LFUS-PAI-P-47296

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