4. Boring or penetrating the earth
  5. With above-ground means for handling drilling fluid or cutting
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Banjo box and blooie line spool

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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Bit packer for dual tube drilling

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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Blasthole drill having a drill pipe seal assembly

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

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