4. Boring or penetrating the earth
  5. With below-ground tool drive prime mover
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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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Earth boring system

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

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Earth drilling mechanisms

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

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Electrical transmission apparatus through rotating tubular...

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

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Electrically powered tractor

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

  [ 0.00 ] – not rated yet Voters 0   Comments 0

Electro-hydraulically controlled tractor

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

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Electro-hydraulically controlled tractor

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

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Electromagnetic drilling apparatus

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

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Electromagnetic drilling apparatus and method

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

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Equipment for drilling vertical boreholes

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

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Expandable ramp gripper

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

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