4. Boring or penetrating the earth
  5. Bit or bit element
  6. Cutting edge self-renewable during operation
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Drag bit and cutters

Boring or penetrating the earth – Bit or bit element – Cutting edge self-renewable during operation
Patent

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Drilling tool fitted with self-sharpening cutting edges

Boring or penetrating the earth – Bit or bit element – Cutting edge self-renewable during operation
Patent

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