Optical Apparatus-Namely, Lenses, Prisms and Filters; Laboratory Measuring Instruments; Optical Benches and Tables; Measuring Tables; Electrically-Operated Light-Emitting Devices-Namely, Laser Arc-Lamps and Light Sources; Optoelectronic Elements-Namely, Radiant Energy Converters; Lasers and Auxillary Optical Devices Therefor; Precision Calibration Elements for Optical Instruments; Telescopes; Microscopes; Cathetometers; and Spectrometers