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

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

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Earth pressure shield

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

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Earth pressure system shield process

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

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Easily-cuttable tunnel segment structure

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

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Elongated underground construction having a uniform section and

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

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Excavated earth and sand transporting apparatus for use in a shi

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

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Excavating machine for tunnels and galleries

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

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Excavation controlling method in hydraulic shield tunnelling

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

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