4. Boring or penetrating the earth
  5. Bit or bit element
  6. Rolling cutter bit or rolling cutter bit element

Kerry S. Kennington

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Nozzle placement in large diameter earth boring bits

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

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Reversal mechanism for power tong

Tools – Wrench – screwdriver – or driver therefor – Machine
Patent

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Profile ID: LFUS-PAI-P-474111

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