4. Hydraulic and earth engineering
  5. Underground passageway, e.g., tunnel
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Head seal for a mine stopping

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

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Holding body to attach a sealing foil of synthetic material to a

Hydraulic and earth engineering – Underground passageway – e.g. – tunnel – Lining
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Horizontal drilling method

Hydraulic and earth engineering – Underground passageway – e.g. – tunnel – Boring
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Horizontal drilling method and apparatus

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

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

Hydraulic and earth engineering – Underground passageway – e.g. – tunnel – Boring
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Hydraulic control systems for and methods of controlling the ope

Hydraulic and earth engineering – Underground passageway – e.g. – tunnel – Boring
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Hydraulically powered door and systems for operating same in...

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

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