Detectors are provided in each working group of the production line to {HEAD ~ output signals} to {TAIL ~ a microcomputer} 
Detectors are provided in each working group of the production line to { HEAD ~ output signals } to { TAIL ~ a microcomputer }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL