Absorbing components as part or accessories for lasers, namely, mirror substrates, beam dumbs, ferrules for stray light suppression, attenuators for power measurement, each of the above goods not for medical purposes; Products of fused silica for use in the chemical industry, the electrical industry, the semiconductor industry and for laboratory purposes, namely, cuvettes, crucibles, dishes, beakers, bells, flanges, tubes, poles, plates, catalyst supports; Quartz glass products for optical de...