4. Boring or penetrating the earth
  5. With above-ground means for handling drilling fluid or cutting
  6. With suction pump inlet communicating with bore bottom
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Drilling device for producing drill holes with an undercut

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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Dry pneumatic system for hard rock shaft drilling

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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