4. Hydraulic and earth engineering
  5. Underground passageway, e.g., tunnel
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Inflatable underground structure liner

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

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Inspectable tunnel for underground pipes and cables

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

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Insulated tunnel liner and rehabilitation system

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

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Insulating tunnel liner system

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

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Insulation of tunnel linings

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

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