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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.
wireless audience participation systems, namely, handheld keypads with transceivers for use by audience members in entering, transmitting and receiving information in an audience environment and associated host transceivers connectable to computers for receiving wireless transmissions; computer software for displaying, analyzing and organizing information transmitted via the audience participation systems and for providing instruction in fields of math, science, social studies, reading and writing, and for creating and viewing slide shows, graphics, text, and sounds