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Septic tanks (Qtpkts)

Computer viruses ()
Vehicles and equipment (Q)
    Equipment (Qt)
         Use For: Apparatus; Devices
         Related Term (Associative): Control devices (Dcj); Communication devices (Dsg); Testing equipment (Gu); Structural parts (Pbp); Building materials (Rbm)
        Equipment by end use (Qtp)
             Related Term (Associative): Types of machines (Qtbmb)
            Containing equipment (Qtpk)
                Tanks (Containers) (Qtpkt)
                    Ballast tanks (Qtpktb)
                    Septic tanks (Qtpkts)