The pneumatic cylinders 19, 19 and 20 are all connected to {TAIL ~ the same air supply} with a special valve governing the flow of air to {HEAD ~ the drive element} 14 
The pneumatic cylinders 19 , 19 and 20 are all connected to { TAIL ~ the same air supply } with a special valve governing the flow of air to { HEAD ~ the drive element } 14
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH