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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.
on-site digital signal processing and display apparatus used in process industries for calculating and displaying the magnitude of desired process measurements, namely, density, level, weight, moisture content, specific gravity, percentage solids, and thickness, in response to input signals from sensors which monitor various process variables