4. Hydraulic and earth engineering
  5. Earth treatment or control
  6. Chemical

Birmingham Bolt Company, Inc.

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Mine roof support anchor and process for installing the same

Hydraulic and earth engineering – Earth treatment or control – Rock or earth bolt or anchor
Patent

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Mine roof truss

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

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Portable tool for bending roof bolts for insertion in mine roof

Metal deforming – By relatively movable offset tool-faces – With tool motion in fixed path
Patent

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Resin reinforced expansion anchor system

Hydraulic and earth engineering – Earth treatment or control – Chemical
Patent

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