4. Boring or penetrating the earth
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Bit face orientation control in drilling operations

Boring or penetrating the earth – Automatic control – Of boring means including a below-ground drive prime mover
Reexamination Certificate

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Boring tool or other device including thermal protection for an

Boring or penetrating the earth – Automatic control
Patent

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Boring tool tracking fundamentally based on drill string...

Boring or penetrating the earth – Automatic control – Of boring means including a below-ground drive prime mover
Reexamination Certificate

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Boring tool tracking fundamentally based on drill string...

Boring or penetrating the earth – Automatic control – Of boring means including a below-ground drive prime mover
Reexamination Certificate

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Boring tool tracking fundamentally based on drill string...

Boring or penetrating the earth – Automatic control – Of boring means including a below-ground drive prime mover
Reexamination Certificate

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Boring tool tracking fundamentally based on drill string...

Boring or penetrating the earth – Automatic control – Of boring means including a below-ground drive prime mover
Reexamination Certificate

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Boring tool tracking fundamentally based on drill string...

Boring or penetrating the earth – Automatic control
Reexamination Certificate

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Bottom hole assembly

Boring or penetrating the earth – Automatic control – Of advance or applied tool weight
Reexamination Certificate

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Bottom hole assembly

Boring or penetrating the earth – Automatic control – Of advance or applied tool weight
Reexamination Certificate

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Buoyant counterbalancing for drill string

Boring or penetrating the earth – Automatic control – Of advance or applied tool weight
Patent

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