4. Boring or penetrating the earth
  5. Bit or bit element
  6. Bit with leading portion forming smaller diameter initial bore
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Combination drilling member

Boring or penetrating the earth – Bit or bit element – Bit with leading portion forming smaller diameter initial bore
Patent

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Cutter head for rotary percussion drills

Boring or penetrating the earth – Bit or bit element – Bit with leading portion forming smaller diameter initial bore
Patent

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Cutting means for drag drill bits

Boring or penetrating the earth – Bit or bit element – Bit with leading portion forming smaller diameter initial bore
Patent

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