4. Hydraulic and earth engineering
  5. Underground passageway, e.g., tunnel
  6. Lining
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Wall supporting arrangement, especially for supporting mine gall

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

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Waterproof cladding construction and method of providing the...

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

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Wedge member for assembling tunnel shield voussoirs

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

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Welded grid, primarily for securing underground cavities, cavity

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

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