4. Boring or penetrating the earth
  5. Cutter element laterally shiftable below ground
  6. Plural selectively shiftable cutter elements

Rock Bit L.P.

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Roller cone bi-center bit

Boring or penetrating the earth – Cutter element laterally shiftable below ground – Plural selectively shiftable cutter elements
Reexamination Certificate

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Stepped polycrystalline diamond compact insert

Boring or penetrating the earth – Bit or bit element – Specific or diverse material
Reexamination Certificate

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