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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 microphone system comprising a portable, battery operated fm transmitter and microphone therefor, and fm receiver with audio output; hearing assistance transmitter system comprising a stationary fm radio transmitter, a battery powered portable fm receiver, and an earphone; hearing assistance transmitter system comprising a portable, battery powered fm radio transmitter and microphone therefor, a battery powered portable fm receiver, and an earphone; hearing assistance system comprising a battery powered, portable audio amplifier with microphone and earphone; hearing assistance system comprising a stationary infrared transmitter and portable, battery powered infrared receiver with earphone; amplified telephone with large keys, adjustable volume and enhance, noise reduction, anti-feedback circuit, and automatic shut-off of amplification; amplified telephone ringer with adjustable volume, tone, and warble; closed circuit intercom to overcome oral communication barriers and including interconnected telephone handsets, one of which provides sound amplification; wireless, multi-channel fm radio system for simultaneous language interpretation comprised of a stationary fm transmitter and portable, battery-powered single channel and multi-channel fm receivers and earphones; speech amplifying system comprised of a portable, battery powered amplifier with microphone and loudspeaker