4. Boring or penetrating the earth
  5. Bit or bit element
  6. Magnetized or with magnet
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Insert retention and cooling apparatus for drag bits

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

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Intermittent high-drag oil well drilling bit

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

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