4. Boring or penetrating the earth
  5. With tool drive prime mover or above-ground mechanical...
  6. With diversely operated shafts extending into bore
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Device for reaming and collecting dust, for a drilling apparatus

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 device with telescopic Kellybar

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 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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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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