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

Archelaius D. Allen

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Control systems

Hydraulic and earth engineering – Earth treatment or control – Ground stabilization or reinforcement
Patent

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Mine roof support and attachment means therefor

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

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Self-advancing mine roof supports

Motors: expansible chamber type – Fluid supply through diverse paths to single expansible chamber – Activation of one path disables second path
Patent

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Underground support devices

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

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Profile ID: LFUS-PAI-P-1272125

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