The slide element has {HEAD ~ a tongue} upwardly extending from {TAIL ~ the front end} thereof and provided with an inclined outer surface which abuts the front end of the cover member 
upwardly extending from
The slide element has { HEAD ~ a tongue } upwardly extending from { TAIL ~ the front end } thereof and provided with an inclined outer surface which abuts the front end of the cover member
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH