Cylinder head {HEAD ~ lower wall} 16 extends over and closes {TAIL ~ opening} 14 of each cylinder 12, while a piston upper portion 18 closes an opening at the lower end of each cylinder 12 
extends over
Cylinder head { HEAD ~ lower wall } 16 extends over and closes { TAIL ~ opening } 14 of each cylinder 12 , while a piston upper portion 18 closes an opening at the lower end of each cylinder 12
OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH REL REL OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH