4. Hydraulic and earth engineering
  5. Underground passageway, e.g., tunnel
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Undercut excavation method

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

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Underground excavator

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

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Underground rock chutes

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

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Underground structural work including prefabricated elements...

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

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Underground tubular structural system and process for producing

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

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Underground tubular structural system and process for producing

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

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Underground work chamber assembly and method for the constructio

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

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Underwater tunnel and an underwater mooring apparatus to moor th

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

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Underwater tunnel construction

Hydraulic and earth engineering – Underground passageway – e.g. – tunnel – Subaqueous
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