4. Boring or penetrating the earth
  5. Bit or bit element
  6. With fluid conduit lining or element
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Novel rotary drill bits and drilling process

Boring or penetrating the earth – Bit or bit element – With fluid conduit lining or element
Patent

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Nozzle assembly for rotary drill bit and method of installation

Boring or penetrating the earth – Bit or bit element – With fluid conduit lining or element
Patent

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Nozzle for rotary bit

Boring or penetrating the earth – Bit or bit element – With fluid conduit lining or element
Patent

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