4. Boring or penetrating the earth
  5. Bit or bit element
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Wellpoint jetting head

Boring or penetrating the earth – Bit or bit element – Casing shoe type
Patent

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Whirl resistant bit

Boring or penetrating the earth – Bit or bit element – Nonsymmetrical bit
Patent

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Whirl resistant bit

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

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Wide groove roller cone bit

Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Reexamination Certificate

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