A precision system 9, wherein {HEAD ~ said fine displacing means} comprises {TAIL ~ a piezo electric element} 
comprises
A precision system 9 , wherein { HEAD ~ said fine displacing means } comprises { TAIL ~ a piezo electric element }
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL