9 laboratory equipment made of quartz glass for use in the chemical, electronic, and semiconductor industries, namely, cells, inspection glasses, flasks, crucibles, trays, bowls, frits, taper-ground joints, wafer carriers, tube reactors for diffusion and epitaxial growth, belljars, flanges, boats, and catalyst carriers; products made of quartz glass for optical devices, namely, lenses, prisms, plates, optical filters, mirrors, mirror plates, and waveguides; optical fibers; and laboratory quartz lamp vessels for ultra-violet radiators and infrared radiators