4. Boring or penetrating the earth
  5. With below-ground tool drive prime mover
  6. Electric
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Bottomhole assembly and methods of use

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

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Downhole drill bit drive motor assembly with an integral bilater

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 – Electric
Patent

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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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High power umbilicals for subterranean electric drilling...

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

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III-V system compound semiconductor device and method for manufa

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

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Inverted motor for drilling rocks, soils and man-made...

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

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Power-generating device for use in drilling operations

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

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