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