{TAIL ~ Paging receiver} in which an announcing unit is automatically controlled at {HEAD ~ a particular time instant} 
{ TAIL ~ Paging receiver } in which an announcing unit is automatically controlled at { HEAD ~ a particular time instant }
TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD