4. Boring or penetrating the earth
  5. With below-ground tool drive prime mover
  6. With below-ground conveyer or impeller for removal of cuttings
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Apparatus for reducing hydro-static pressure at the drill bit

Boring or penetrating the earth – With below-ground tool drive prime mover – With below-ground conveyer or impeller for removal of cuttings
Patent

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Device for borehole hydraulic mining

Boring or penetrating the earth – With below-ground tool drive prime mover – With below-ground conveyer or impeller for removal of cuttings
Patent

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Drilling apparatus with dynamic cuttings removal and cleaning

Boring or penetrating the earth – With below-ground tool drive prime mover – With below-ground conveyer or impeller for removal of cuttings
Patent

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Drilling apparatus with dynamic cuttings removal and cleaning

Boring or penetrating the earth – With below-ground tool drive prime mover – With below-ground conveyer or impeller for removal of cuttings
Patent

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Earth boring apparatus

Boring or penetrating the earth – With below-ground tool drive prime mover – With below-ground conveyer or impeller for removal of cuttings
Patent

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Flexpower deep well drill

Boring or penetrating the earth – With below-ground tool drive prime mover – With below-ground conveyer or impeller for removal of cuttings
Patent

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In-hole motor with bit clutch

Boring or penetrating the earth – With below-ground tool drive prime mover – With below-ground conveyer or impeller for removal of cuttings
Patent

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Pipe-driving apparatus

Boring or penetrating the earth – With below-ground tool drive prime mover – With below-ground conveyer or impeller for removal of cuttings
Patent

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