To simplify {HEAD ~ the installation} of {TAIL ~ the closing part} 16, the latching means 18, 19 have introducing slopes 22 
of
To simplify { HEAD ~ the installation } of { TAIL ~ the closing part } 16 , the latching means 18 , 19 have introducing slopes 22
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH