4. Boring or penetrating the earth
  5. Cutter element laterally shiftable below ground
  6. Plural selectively shiftable cutter elements
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Concentric expandable reamer and method

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

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Downhole unit for use in boreholes in a subsurface formation

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

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Morphable bit

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

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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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