The latching means 18, 19 have guide edges 20 in {HEAD ~ their regions} facing {TAIL ~ the closing part} 16 
The latching means 18 , 19 have guide edges 20 in { HEAD ~ their regions } facing { TAIL ~ the closing part } 16
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH