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