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Scientific, nautical, surveying, photographic, cinematographic, optical, weighing, measuring, signalling, checking (supervision), life-saving and teaching apparatus and instruments; apparatus and instruments for conducting, switching, transforming, accumulating, regulating or controlling electricity; apparatus for recording, transmission or reproduction of sound or images; magnetic data carriers, recording discs; automatic vending machines and mechanisms for coin-operated apparatus; cash registers, calculating machines, data processing equipment and computers; fire-extinguishing apparatus.
testing and measuring equipment for use in testing the performance and efficiency of power plant equipment, namely, isokinetic coal samplers, dirty-air velocity probes, flue-inserted flyash sampler, forward-reverse pitot tube, coarse particle guide classifer blades, and airflow measuring devices