4. Boring or penetrating the earth
  5. Bit or bit element
  6. Plural separable cutter elements
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Two-prong rotary bit, especially for use with roof drills, and i

Boring or penetrating the earth – Bit or bit element – Plural separable cutter elements
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Well perforation device

Boring or penetrating the earth – Bit or bit element – Plural separable cutter elements
Patent

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