said mounting fixtures are capable of inverting {TAIL ~ a mounting direction} of said device relative to said {HEAD ~ first user}, 
said mounting fixtures are capable of inverting { TAIL ~ a mounting direction } of said device relative to said { HEAD ~ first user } ,
OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH