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

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

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Rectangular shield excavating machine

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

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Rock drilling rig

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

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