Also, {TAIL ~ an X axis drive system} and a Y axis drive system are provided for driving {HEAD ~ the tool holding unit} in the XY plane 
Also , { TAIL ~ an X axis drive system } and a Y axis drive system are provided for driving { HEAD ~ the tool holding unit } in the XY plane
OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH