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