The magnetization of the cylinder electromagnet generates magnetically attracting force between the cylinder and the piston to cause {TAIL ~ the piston} to move in {HEAD ~ a one direction} and thereafter magnetically repellent force to transfer the piston in the opposite direction 
The magnetization of the cylinder electromagnet generates magnetically attracting force between the cylinder and the piston to cause { TAIL ~ the piston } to move in { HEAD ~ a one direction } and thereafter magnetically repellent force to transfer the piston in the opposite direction
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH