4. Boring or penetrating the earth
  5. With tool drive prime mover or above-ground mechanical...
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Drilling head with bayonet coupling

Boring or penetrating the earth – With tool drive prime mover or above-ground mechanical... – Rotary drive for a relatively advancing tool
Patent

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Drilling machine for drilling large drilling holes in rock, part

Boring or penetrating the earth – With tool drive prime mover or above-ground mechanical... – Rotary drive for a relatively advancing tool
Patent

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Drilling tool

Boring or penetrating the earth – With tool drive prime mover or above-ground mechanical... – With diversely operated shafts extending into bore
Patent

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Drilling with concentric strings of casing

Boring or penetrating the earth – With tool drive prime mover or above-ground mechanical... – With installing casing
Reexamination Certificate

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Dual string orbital drilling system

Boring or penetrating the earth – With tool drive prime mover or above-ground mechanical... – With diversely operated shafts extending into bore
Reexamination Certificate

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