{HEAD ~ The apparatus} 8, wherein {TAIL ~ said alerting means} includes means for transmitting a distinguishable audio signal 
wherein
{ HEAD ~ The apparatus } 8 , wherein { TAIL ~ said alerting means } includes means for transmitting a distinguishable audio signal
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH