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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.
computer-based electric and magnetic field data acquisition systems comprising industrial-grade central processing units, analog to digital converter boards, buffer cards, parallel input/output units, [sixty megabyte disks,] racks for holding and mounting the system hardware, [9600 baud modems,] interface units, video monitors, keyboards, autoranging ac current sensors, ac voltage sensors, multiplexors, autoranging dc/ac amplifiers, autoranging dc current sensors, triaxial flux gates, autoranging hardened ac magnetic field probes, cables, and computer programs for use with the above identified apparatus and equipment