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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.
hydrometers, densitometers, viscometers, balances, filter testers, sand content testers, ph testers, alkalimeters, ion testers, pressure testers, mud testers, titration apparatus, and like testing equipment especially adapted for testing oil well drilling mud, oil well cores, oil well cuttings, clay and mineral suspensions and compositions, and the like