4. Boring or penetrating the earth
  5. With tool shaft detail
  6. Helix or helically arranged structure
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Drilling tool with an interchangeable conveying spiral

Boring or penetrating the earth – With tool shaft detail – Helix or helically arranged structure
Patent

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Dry hollow stem augers

Boring or penetrating the earth – With tool shaft detail – Helix or helically arranged structure
Patent

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