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Parts of tunnels (Pdvtb)

Computer viruses ()
Facilities (P)
     Use For: Complexes; Installations
    Specialized facilities (Pd)
        Underground structures (Pdv)
             Use For: Subsurface structures; Underground facilities
             Related Term (Associative): Pipelines (Pmnp); Underground utility lines (Pmptmu); Highway facilities (Pmr)
            Tunnels (Pdvt)
                 Related Term (Associative): Computer viruses ()
                Parts of tunnels (Pdvtb)
                    Tunnel lining (Pdvtbm)
                    Tunnel shafts (Pdvtbr)
                    Tunnel supports (Pdvtbs)
                Tunnels by use (Pdvtr)