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Signal lights (Dsgpk)

Computer viruses ()
Communication and control (D)
    Communication (Ds)
         Related Term (Associative): Computer viruses ()
        Communication devices (Dsg)
             Use For: Communication equipment
             Related Term (Associative): Equipment (Qt)
            Signal devices (Dsgp)
                 Use For: Signal equipment
                Signal lights (Dsgpk)
                     Related Term (Associative): Traffic signal indications (Dcmthcsm)