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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.
pressurization and purge control systems, namely, control units, filters, relief valves, outlet orifices, and spark arrestors, sold individually and as a unit; pressurized, dust-tight, flame proof and explosion proof electrical enclosures; and, intrinsically safe information technology products, namely, equipment used with computers and multi-media applications, specifically, keyboards, trackballs, joysticks, computer monitors, bar code readers and components thereof which have been designed and manufactured to be used safely in the presence of explosive gas or dust