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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.
high sensitivity high speed recorders of magnitudes of temperature, humidity, frequency, speed, pressure, conductivity, ion concentration, rate of flow of fluids, electric current, electrical impedance, electrical potentials and voltages, [ turbidity, photo electric effects, ] and composition of mixtures; recorders controlled by a member deflecting in response to the magnitude or changes in magnitude to be recorded; high sensitivity electric controllers and regulators of temperature, humidity, conductivity of fluids, ion concentration, combustion, rate of flow and pressure of fluids, composition of mixtures, electric circuits, electric currents, electro-motive forces,and electrical impedances; for electric controllers of steam generator furnaces and for electric controllers of steam generation; for electric controllers, regulators, and governors of speed and frequency; and for electric controllers and regulators of frequency of electric and mechanical vibration