4. Boring or penetrating the earth
  5. With above-ground means for handling drilling fluid or cutting
  6. With valve
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Door drilling Kelly

Boring or penetrating the earth – With above-ground means for handling drilling fluid or cutting – With valve
Patent

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Drill string valve assembly

Boring or penetrating the earth – With above-ground means for handling drilling fluid or cutting – With valve
Reexamination Certificate

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Drill tube for use in upward rock drilling

Boring or penetrating the earth – With above-ground means for handling drilling fluid or cutting – With valve
Patent

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