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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.
tools, machinery and instrumentation for testing, maintaining, cleaning, and operating aircraft engines on the ground consisting of structures for mounting the engines; power absorption devices such as club propellars, air dynamometers and water brakes; sensors, meters, and electronic controls for monitoring the operating parameters of the engine; compressors, regulators, reservoirs, hoses, and nozzles operatively associated for spraying fluid; all combined in a unitary system and mounted on a carriage, within a trailer or on a vehicle to make the system mobile