Peter Marr

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Auxiliary walking mine support

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

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Breast roof support system for longwall mining

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Hydraulically operated mine prop with safety valve

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

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Method and apparatus for advancing and supporting an underground

Mining or in situ disintegration of hard material – Processes – Stabilizing underground structure
Patent

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Pit prop assembly

Patent

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Profile ID: LFUS-PAI-P-6193

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