4. Boring or penetrating the earth
  5. With below-ground tool drive prime mover
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Casing lateral wells

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

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Chain drive system

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

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Circulation sub for in-hole hydraulic motors

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

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Combination thrust and radial bearing for use in down-hole drill

Boring or penetrating the earth – With below-ground tool drive prime mover – With positive connection between tool and support shaft for...
Patent

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Combustion operated 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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Continuous drill feed apparatus

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

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Converter group and pressure converter for use therein

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

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Core drilling tool for boreholes in rock

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

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Coupling for a downhole tandem drilling motor

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

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