In operation, the laser beam 30 from {HEAD ~ the laser} 12 is directed by the mirror 14 to a focusing lens 16, which concentrates or focuses {TAIL ~ the laser beam} 30 into the sintering nozzle 28 
In operation , the laser beam 30 from { HEAD ~ the laser } 12 is directed by the mirror 14 to a focusing lens 16 , which concentrates or focuses { TAIL ~ the laser beam } 30 into the sintering nozzle 28
OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH