4. Ventilation
  5. Having protecting air current
  6. Surrounding protected area

Pablo Girault

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Method and apparatus for lifting gas streams to a great elevatio

Ventilation – Having protecting air current – Surrounding protected area
Patent

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Method of excavating tunnels

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

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Profile ID: LFUS-PAI-P-263924

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