4. Boring or penetrating the earth
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Unbalanced PDC drill bit with right hand walk tendencies, and me

Boring or penetrating the earth – Processes – Boring curved or redirected bores
Patent

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Underground drilling device and method employing down-hole...

Boring or penetrating the earth – Processes – Boring curved or redirected bores
Reexamination Certificate

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Underground propelling method

Boring or penetrating the earth – Processes – Boring curved or redirected bores
Patent

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Underground radial pipe network

Boring or penetrating the earth – Processes – Boring curved or redirected bores
Patent

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Using a rotating inner member to drive a tool in a hollow...

Boring or penetrating the earth – Processes – Boring curved or redirected bores
Reexamination Certificate

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Using a rotating inner member to drive a tool in a hollow...

Boring or penetrating the earth – Processes – Boring curved or redirected bores
Reexamination Certificate

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Using a rotating inner member to drive a tool in a hollow...

Boring or penetrating the earth – Processes – Boring curved or redirected bores
Reexamination Certificate

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Using a rotating inner member to drive a tool in a hollow...

Boring or penetrating the earth – Processes – Boring curved or redirected bores
Reexamination Certificate

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Using hydrostatic bearings for downhole applications

Boring or penetrating the earth – Processes – Boring curved or redirected bores
Reexamination Certificate

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