4. Hydraulic and earth engineering
  5. Underground passageway, e.g., tunnel
  6. Sectional
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Method for constructing a rectangularly shaped tunnel

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

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Method of constructing reinforced concrete works such as undergr

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

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Method of excavating tunnels

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

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Method of manufacturing a tunnel or shaft lining or pipeline

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

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