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