4. Boring or penetrating the earth
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Hard material insert for a drill and a drill with the hard...

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

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Hard metal or hard material tipped drilling, chipping and cuttin

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

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Heat management drilling system and method

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

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High-strength, high-toughness matrix bit bodies

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

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High-strength/high toughness alloy steel drill bit blank

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

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High-strength/high toughness alloy steel drill bit blank

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

  [ 0.00 ] – not rated yet Voters 0   Comments 0

High-strength/high-toughness alloy steel drill bit blank

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

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Hydraulic mining nozzle-air lift device

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

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