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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; apparatus and equipment for use in connection with the processing, recording, reproduction, transmission and/or reception of electronic signals; apparatus and equipment for use in connection with the processing, recording, reproduction, transmission and/or reception of digital signals; computer software; telecommunications and conferencing apparatus; audio conferencing consoles; digital signal processors; digital switching systems; audio mixer output expanders; earphones; earphone sleeves; earphone cases; headphones; headsets; headset sleeves; microphone booms; audio attenuators; electrical filters; electrical phase reversers; tone generators; microphone adapters for video equipment; network interface adapters; computer software for digital signal processing; computer software for digital feedback reduction; computer software for monitoring and controlling wireless audio systems; cases and carriers for all of the aforesaid goods; parts, fittings and accessories for all the aforesaid goods