Using the manipulating handle {HEAD ~ the display unit} is wheeled to the site of {TAIL ~ the demonstration} 
Using the manipulating handle { HEAD ~ the display unit } is wheeled to the site of { TAIL ~ the demonstration }
OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL