In one embodiment, the positioner is a piezoelectric positioner and in other embodiments, {HEAD ~ the positioner} is a servomechanism or {TAIL ~ a shape memory alloy} 
is
In one embodiment , the positioner is a piezoelectric positioner and in other embodiments , { HEAD ~ the positioner } is a servomechanism or { TAIL ~ a shape memory alloy }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL