4. Boring or penetrating the earth
  5. Bit or bit element
  6. Cutting edges facing in opposite axial directions
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Anti-collaring structure for impact bit

Boring or penetrating the earth – Bit or bit element – Cutting edges facing in opposite axial directions
Patent

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Drill bit for reverse drilling

Boring or penetrating the earth – Bit or bit element – Cutting edges facing in opposite axial directions
Patent

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Drill bit for trenchless drilling

Boring or penetrating the earth – Bit or bit element – Cutting edges facing in opposite axial directions
Reexamination Certificate

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Earth-boring bit with shear cutting gage

Boring or penetrating the earth – Bit or bit element – Cutting edges facing in opposite axial directions
Patent

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Fixed cutter bit with shear cutting gage

Boring or penetrating the earth – Bit or bit element – Cutting edges facing in opposite axial directions
Patent

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Reversible bit assembly

Boring or penetrating the earth – Bit or bit element – Cutting edges facing in opposite axial directions
Patent

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Rock drill bit having retrac teeth and method for its...

Boring or penetrating the earth – Bit or bit element – Cutting edges facing in opposite axial directions
Reexamination Certificate

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