4. Boring or penetrating the earth
  5. Bit or bit element
  6. With fluid conduit lining or element
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Orientable fluid nozzle for drill bits

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

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Overburden eliminator rock drill bit

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

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