LandOfFree - US Patents - Listing for Boring or penetrating the earth,With below-ground tool drive prime mover,With mechanical motion-converting means

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Boring and drilling apparatus

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

Reexamination Certificate

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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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Drill bit

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

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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Flow pulsing apparatus with axially movable valve

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

Patent

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Gear system for an oil well drive

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

Patent

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Intermittently rotatable down hole drilling tool

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

Patent

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Mechanically nutating drill driven by orbiting mass oscillator

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

Patent

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Motor shaft security apparatus

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

Reexamination Certificate

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Reduction unit of drilling motor

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

Patent

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Rotary and mud-powered percussive drill bit assembly and method

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

Reexamination Certificate

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