4. Hydraulic and earth engineering
  5. Underground passageway, e.g., tunnel
  6. Boring

Ludwig Pfeiffer

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Apparatus for making small-bore tunnels

Mining or in situ disintegration of hard material – Hard material disintegrating machines – With mine roof-supporting means
Patent

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Apparatus for underground tunneling

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

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Profile ID: LFUS-PAI-P-666643

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