The connector part 17 consists of {HEAD ~ projecting tabs} 18, which taper to {TAIL ~ a point} at their free ends 
taper to
The connector part 17 consists of { HEAD ~ projecting tabs } 18 , which taper to { TAIL ~ a point } at their free ends
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH