4. Boring or penetrating the earth
  5. With above-ground means to feed tool
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Top drive systems

Boring or penetrating the earth – With above-ground means to feed tool
Reexamination Certificate

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Transportation, storage, and installation system for rig...

Boring or penetrating the earth – With above-ground means to feed tool
Reexamination Certificate

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Turbine pump ring for drilling heads

Boring or penetrating the earth – With above-ground means to feed tool
Patent

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Wellbore top drive systems

Boring or penetrating the earth – With above-ground means to feed tool
Reexamination Certificate

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