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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.
acousticons, church acousticons, acousticon batteries; interior communicating telephone systems for offices, banks, factories, etc.; interior telephone systems for apartment buildings providing communication between vestibule, apartments, janitor, tradesmen, or other essential points; loud-speaking paging or announcing systems for locating doctors in a hospital, announcing systems employing loud speakers operated from central transmitting station, loud-speaking limousine telephones,radio loud speakers, radio receiving sets, switches for radio receiving sets with one or more loud speakers, radio loudspeaking receiver units for attachment to sounding boards of pianos; listening devices employing supersensitive transmitters and headset receivers for use by detective agencies, police departments, etc.; and sensitive transmitters used as essential parts of burglar alarms and vault protection systems whose operation is controlled by sound waves