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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.
electric motor control apparatus, including speed controls for series, shunt and compound electric motors, embodying adjustable transformers, rectifiers, chokes, switches, braking and other resistors, and lamps; adjustable autotransformers, including output terminals for connection to electric heaters, ovens, electric lights and lamps, motors, power supplies, rectifiers, voltage-aging equipment for lamps, vacuum tubes and dry-disk rectifiers; motor-driven autotransformers including motors of the servo type, coupling gears, phase shift and other capacitors, and limit switches; voltage regulators including automatic voltage regulators embodying adjustable autotransformers and servomechanism for controlling the setting thereof; multiple-phase voltage regulators, including single and three-phase regulators; and cabinets, cases, chassis, electric power cords and electric lines, dials, control knobs, terminal strips, brushes and connectors for the above-named transformers, regulators and control apparatus