4. Hydraulic and earth engineering
  5. Underground passageway, e.g., tunnel
  6. Boring

Stuart Harrison

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Cutting apparatus for a microtunnelling system

Boring or penetrating the earth – Bit or bit element – Rolling cutter bit or rolling cutter bit element
Reexamination Certificate

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Drill head for a microtunnelling apparatus

Hydraulic and earth engineering – Underground passageway – e.g. – tunnel – Boring
Reexamination Certificate

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Microtunnelling system and apparatus

Boring or penetrating the earth – With above-ground means for handling drilling fluid or cutting – With tool shaft having plural passages for drilling fluid
Reexamination Certificate

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Profile ID: LFUS-PAI-P-2250516

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