4. Boring or penetrating the earth
  5. Bit or bit element
  6. Magnetized or with magnet
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Self sharpening drag bit for sub-surface formation drilling

Boring or penetrating the earth – Bit or bit element – Magnetized or with magnet
Patent

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Self-renewing multi-element cutting structure for rotary drag bi

Boring or penetrating the earth – Bit or bit element – Magnetized or with magnet
Patent

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Solid head bit with tungsten carbide central core

Boring or penetrating the earth – Bit or bit element – Magnetized or with magnet
Patent

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