4. Boring or penetrating the earth
  5. With tool drive prime mover or above-ground mechanical...
  6. Rotary drive for a relatively advancing tool

Cubex Limited

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Pressure control of a drilling apparatus

Boring or penetrating the earth – With tool drive prime mover or above-ground mechanical... – Rotary drive for a relatively advancing tool
Reexamination Certificate

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Rock drill bit

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

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