4. Boring or penetrating the earth
  5. With below-ground tool drive prime mover
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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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Drilling apparatus

Boring or penetrating the earth – With below-ground tool drive prime mover
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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Drilling bit assembly and apparatus

Boring or penetrating the earth – With below-ground tool drive prime mover – With mechanical motion-converting means
Reexamination Certificate

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Drilling column with sledgehammer drilling head

Boring or penetrating the earth – With below-ground tool drive prime mover – Discharge passage for motive fluid directed toward bore...
Patent

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Drilling device

Boring or penetrating the earth – With below-ground tool drive prime mover – Plural below-ground drive prime movers
Patent

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Drilling device

Boring or penetrating the earth – With below-ground tool drive prime mover – With below-ground feed means
Patent

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Drilling device for drilling a core in deep drill holes

Boring or penetrating the earth – With below-ground tool drive prime mover – Fluid rotary type
Patent

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Drilling machine

Boring or penetrating the earth – With below-ground tool drive prime mover – With means to anchor prime movers support to bore wall
Patent

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Drilling machine

Boring or penetrating the earth – With below-ground tool drive prime mover – With below-ground feed means
Patent

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Drilling machine for digging trenches in the ground

Boring or penetrating the earth – With below-ground tool drive prime mover – Plural below-ground drive prime movers
Patent

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Drilling motor that operates pursuant to the Moineau...

Boring or penetrating the earth – With below-ground tool drive prime mover – Fluid rotary type
Reexamination Certificate

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Drilling system

Boring or penetrating the earth – With below-ground tool drive prime mover – Electric
Patent

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Drilling system

Boring or penetrating the earth – With below-ground tool drive prime mover – Fluid rotary type
Patent

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Drilling turbine

Boring or penetrating the earth – With below-ground tool drive prime mover – Fluid rotary type
Reexamination Certificate

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Drilling with casing and retrievable drill bit

Boring or penetrating the earth – With below-ground tool drive prime mover – Fluid rotary type
Patent

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Drilling with multiple in-hole motors

Boring or penetrating the earth – With below-ground tool drive prime mover – Plural below-ground drive prime movers
Patent

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Drive device for a drill bit

Boring or penetrating the earth – With below-ground tool drive prime mover – Fluid rotary type
Patent

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Drive system

Boring or penetrating the earth – With below-ground tool drive prime mover – Fluid rotary type
Reexamination Certificate

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