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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.
breathing air filtration equipment for removing particles from an air stream, namely, a self-contained breathing air filtration device comprised of a housing maintaining an ionizer and ground electrodes for producing an electrical field that interacts with particles in a breathing air stream passing through the housing to create clusters of the particles, and a filter maintained in the housing for collecting and separating the clusters of the particles from the breathing air stream passing through the housing