A piston coupled to {TAIL ~ a piston rod} is fitted in a sealed cylinder in which {HEAD ~ oil} is contained 
A piston coupled to { TAIL ~ a piston rod } is fitted in a sealed cylinder in which { HEAD ~ oil } is contained
OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD OTH OTH