{HEAD ~ The product} has greatly improved wear resistance for severe abrasive environments and comprises {TAIL ~ a substantially optically transparent substrate}, a chemicaly vapor deposited first interlayer bonded to the substrate and a chemically vapor deposited outer layer of substantially optically transparent diamond like carbon bonded to the interlayer and away from the substrate 
comprises
{ HEAD ~ The product } has greatly improved wear resistance for severe abrasive environments and comprises { TAIL ~ a substantially optically transparent substrate } , a chemicaly vapor deposited first interlayer bonded to the substrate and a chemically vapor deposited outer layer of substantially optically transparent diamond like carbon bonded to the interlayer and away from the substrate
HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH