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