According to {TAIL ~ another embodiment} of the invention, {HEAD ~ the pockets} are defined by inturned edges on the covers which embrace a boundary of a recess formed in the surface of the movable element exposed to hot gases of combustion 
According to
According to { TAIL ~ another embodiment } of the invention , { HEAD ~ the pockets } are defined by inturned edges on the covers which embrace a boundary of a recess formed in the surface of the movable element exposed to hot gases of combustion
REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH