4. Hydraulic and earth engineering
  5. Underground passageway, e.g., tunnel
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Block unit for repairing flow passage facilities and method...

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

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Box culvert traveler for use with concrete forming systems

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

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Bracing device for a self-advancing shield tunnelling machine

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

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Brush-type packing means for shield excavator

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

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