4. Hydraulic and earth engineering
  5. Underground passageway, e.g., tunnel
  6. Boring
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Device for opening and supporting a headway

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

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Direction correcting device for shield tunnelling machine

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

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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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Drilling apparatus and method for its control

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

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Drive shield

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

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Drive shield

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

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Drive shields for tunnel-driving apparatus

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

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