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Directional self-propelled drill

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

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Downhole flexible drive 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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Downhole flexible drive system

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

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Downhole flexible drive system

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

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Downhole hammer-type core barrel

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

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Downhole hammer-type core barrel and method of using same

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

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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 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 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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