4. Boring or penetrating the earth
  5. Processes

Allan S. Richardson

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Backup tool and method for preventing rotation of a drill string

Boring or penetrating the earth – Processes
Patent

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Drilling rig

Boring or penetrating the earth – With above-ground guide for relatively advancing tool
Patent

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Portable top drive

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

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Portable top drive

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

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Power tong wrench

Tools – Wrench – screwdriver – or driver therefor – Machine
Patent

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Profile ID: LFUS-PAI-P-41782

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