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Warning systems (Hhw)

Safety and security (H)
    Hazards and emergency operations (Hh)
         Use For: Emergency services
        Hazards (Hhd)
             Use For: Danger
             Related Term (Associative): ; Environmental risk assessment (Jfd)
        Disasters and emergency operations (Hhg)
        Radiation hazards (Hhr)
        Fires (Hhu)
        Warning systems (Hhw)