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accidents Alberta anchored beams boards bolts braced brackets brake building industry building operations cables cage carried chains cleats Code construction CZECHOSLOVAKIA dangerous defects derrick diameter distance elevator employed employer equipment erected exceed factor of safety falling feet FINLAND fitted fixed floor gangways gear ground guard guard-rails height hoisting appliances hooks inches inspection installed IRISH FREE iron Jib Cranes joists Labour ladders laid lashed least ledgers less lifting lowering machinery maximum load means nailed necessary openings Order outriggers persons placed planks POLAND pole scaffolds prevent prohibited pulley putlogs Queensland rails regulations repair rungs runway safe working load scaffold platforms securely fastened shaft sheaves side slipping South Wales space stage stairs standards steel storeys strength structure sufficient suitable suspended scaffolds SWITZERLAND SWITZERLAND Geneva temporary tested thick timber toe-boards towers trestle scaffolds uprights URUGUAY wall Western Australia width winch wire ropes workers workplace