{HEAD ~ The tungsten carbide} can be essentially {TAIL ~ any type} as long as the particle size is less than about 1 micrometer in mean diameter 
essentially
{ HEAD ~ The tungsten carbide } can be essentially { TAIL ~ any type } as long as the particle size is less than about 1 micrometer in mean diameter
HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH