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Automatic block signal systems (Dcmtrsbb)

Communication and control (D)
    Control (Dc)
         Use For: Control theory
        Control system applications (Dcm)
            Traffic control (Dcmt)
                 Related Term (Associative): Traffic (Bt)
                Railroad traffic control (Dcmtr)
                    Railroad signaling (Dcmtrs)
                        Block signal systems (Dcmtrsb)
                            Automatic block signal systems (Dcmtrsbb)