{HEAD ~ A computer controlled wireless focus mechanism} is used to regulate {TAIL ~ the vertical distance} between the focused laser assembly and the work surface 
is used to regulate
{ HEAD ~ A computer controlled wireless focus mechanism } is used to regulate { TAIL ~ the vertical distance } between the focused laser assembly and the work surface
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH