4. Boring or penetrating the earth
  5. Bit or bit element
  6. Magnetized or with magnet

George Fyfe

Inventor

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Attachment means for drilling equipment

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

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Convex shaped diamond cutting elements

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

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Revolving cutters for rock bits

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

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Roller reamer

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

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Profile ID: LFUS-PAI-P-1103754

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