In other words, {HEAD ~ an active control signal} 47 turns on {TAIL ~ an isolation device} to allow a potential to be conducted from one location to another location 
turns on
In other words , { HEAD ~ an active control signal } 47 turns on { TAIL ~ an isolation device } to allow a potential to be conducted from one location to another location
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH