Treatment of material by means of etching, coating, heat treatment, CNC (computer numerical control) machining, laser cutting, laser polishing, fire glaze CNC (computer numerical control), sintering, annealing; treatment of materials, namely, treatment of quartz glass surfaces; treatment of materials, namely, treatment of ceramic surfaces; treatment of material by applying partial opaque reflective coating onto fused silica parts, including parts of lamps, windows, tubes, reactor chambers; tr...