4. Boring or penetrating the earth
  5. With above-ground means for handling drilling fluid or cutting
  6. With tool shaft having plural passages for drilling fluid
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Hammer drill bit and sub-assembly

Boring or penetrating the earth – With above-ground means for handling drilling fluid or cutting – With tool shaft having plural passages for drilling fluid
Patent

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High pressure fluid apparatus

Boring or penetrating the earth – With above-ground means for handling drilling fluid or cutting – With tool shaft having plural passages for drilling fluid
Patent

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Hydraulic device for forming a cavity in a borehole

Boring or penetrating the earth – With above-ground means for handling drilling fluid or cutting – With tool shaft having plural passages for drilling fluid
Patent

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