{HEAD ~ The objective} of the invention is to enable {TAIL ~ the metal sheet} to be fixed in a simple manner 
is to enable
{ HEAD ~ The objective } of the invention is to enable { TAIL ~ the metal sheet } to be fixed in a simple manner
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH