9 Optical materials, namely, lenses, prisms, wedges, wafers, domes, tubes, rods and photo-blanks for industrial optical applications, research and analytical instrumentation; optical fiber cable and parts thereof electrical cable; communications cables; optical filters, sensors, namely, fiber optic sensors, photoelectric sensors, semiconductor sensors, mechanical sensor, ultrasonic ceramic sensors, pyroelectric infrared sensors, integrated optical circuits and parts and fittings thereof, namely, transceivers, optical switches, optical couplers, optical waveguides, pressure sensors, interferometers, optical gyros, optical delay, lines, optical signal processors, distance measurers, temperature sensors, chemical sensors, biological sensors, fiber optic couplers, multi/demultiplexers, wavelength filters, and optical modulators