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Helicopter lines (Nbbcbh)

Computer viruses ()
Organizations (N)
     Use For: Organisations
    Businesses (Nb)
         Use For: Service industries
        Carriers (Nbb)
             Use For: Intermodal transportation companies
            Carriers by mode (Nbbc)
                Airlines (Nbbcb)
                     Use For: Air carriers; Air lines; Airline industry
                     Related Term (Associative): 
                    Local service airlines (Nbbcbb)
                    Commuter airlines (Nbbcbc)
                    Regional airlines (Nbbcbd)
                    Supplemental airlines (Nbbcbf)
                         Related Term (Associative): Air charter service (Bbgca)
                    Helicopter lines (Nbbcbh)