4. Boring or penetrating the earth
  5. Bit or bit element
  6. With helical-conveying portion
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Backreamer

Boring or penetrating the earth – Bit or bit element – With helical-conveying portion
Patent

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Boring tool with rectangular plates

Boring or penetrating the earth – Bit or bit element – With helical-conveying portion
Reexamination Certificate

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Broach for incorporation in a drill string

Boring or penetrating the earth – Bit or bit element – With helical-conveying portion
Patent

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