4. Boring or penetrating the earth
  5. With above-ground means for handling drilling fluid or cutting
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Particulate material intercepting arrangement for a hand held to

Boring or penetrating the earth – With above-ground means for handling drilling fluid or cutting – Fluid or cuttings directing or receiving means engaging bore...
Patent

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Pressure seal for pumping instruments through drill rod

Boring or penetrating the earth – With above-ground means for handling drilling fluid or cutting – Fluid head on tool shaft having lateral port and axial...
Patent

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Pump for a reverse circulation rotary drilling rig

Boring or penetrating the earth – With above-ground means for handling drilling fluid or cutting – With suction pump inlet communicating with bore bottom
Patent

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