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