{HEAD ~ The alert signal} is coupled to {TAIL ~ the alert device} 630, which is typically either an audible or a silent alerting device 
is coupled to
{ HEAD ~ The alert signal } is coupled to { TAIL ~ the alert device } 630 , which is typically either an audible or a silent alerting device
HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH