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Obstruction buoys (Dcnsysdp)

Computer viruses ()
Communication and control (D)
    Control (Dc)
         Use For: Control theory
        Navigation (Dcn)
            Navigational aids (Dcns)
                 Use For: Navaids; Navigation aids
                Navigational aids specific to a craft or vehicle (Dcnsy)
                    Ship navigational aids (Dcnsys)
                        Buoys (Dcnsysd)
                            Obstruction buoys (Dcnsysdp)