The axis elevating means carries {TAIL ~ a support surface} which is accessible by {HEAD ~ a human operator} 
The axis elevating means carries { TAIL ~ a support surface } which is accessible by { HEAD ~ a human operator }
OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD