{HEAD ~ A plurality} of {TAIL ~ lane boxes} are provided for backup of a touch signal and a starting block signal, in case of failure and misoperation of the control device 
{ HEAD ~ A plurality } of { TAIL ~ lane boxes } are provided for backup of a touch signal and a starting block signal , in case of failure and misoperation of the control device
HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH