4. Hydraulic and earth engineering
  5. Earth treatment or control
  6. Shoring, bracing, or cave-in prevention

Alfred Bollmann

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Arrangement for controlled engagement of the tools of a mining m

Mining or in situ disintegration of hard material – Hard material disintegrating machines – Cutter attached to endless chain or cable
Patent

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Mine roof support

Hydraulic and earth engineering – Earth treatment or control – Shoring – bracing – or cave-in prevention
Patent

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Mine roof support

Hydraulic and earth engineering – Earth treatment or control – Shoring – bracing – or cave-in prevention
Patent

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Walking prop for mine tunnels

Hydraulic and earth engineering – Earth treatment or control – Shoring – bracing – or cave-in prevention
Patent

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Profile ID: LFUS-PAI-P-251426

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