Measurement apparatus, namely, apparatus for determining the change in resistance of a material on irradiation with ultraviolet (UV) radiation and for detecting a radiation dose; scientific and technical apparatus, namely, optical windows, lenses, mirrors, prisms or reflectors of natural or synthetic quartz glass, for use in detectors for determining physical variables of electromagnetic waves, spectrometers, reflectometers, interferometers, laser cavities, installations for photolithographic...

Optical Articles, Such as Prisms, Lenses, Plates, Mirrors, Rods and Ingots of Optical Material and Transparent or Translucent Laboratory and Industrial Articles, Including Those Transparent or Translucent for Infrared or Ultraviolet Radiation, Such as Tubes, Containers and Receptacles and Crucibles

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