4. Hydraulic and earth engineering
  5. Underground passageway, e.g., tunnel
  6. Lining
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Method of forming flooring in tunnels

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

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Method of lining a tunnel and apparatus for performing the same

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

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Method of producing a concrete lined tunnel or other underground

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

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Method of renovating and/or protecting sewers and pipes

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

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Methods of and apparatus for applying roof mats to mine workings

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

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Mill hole liner ring connector assembly

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

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Mine stopping

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

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Mine stopping having a swinging door

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

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Mobile train for backfilling tunnel liners with cement grout

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

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