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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.
unitary ship's log apparatus of which the following are the constituent parts: rod meters, sea valves, comprising gate valves and gear for operating same; rotary distance transmitters, comprising rotary pumps, electric driving motors, variable auto-transformers, rectifiers, self-synchronous motors, follow-up motors, revolution counters; hydraulic bellows and electric contacts operated thereby; master speed indicators; speed and distance indicators; and constant frequency control apparatus for controlling the frequencies of the alternating current output of a rotary converter and comprising synchronous motors, electrically driven tuning forks, amplifier tubes, rheostats, transformers, condensers, and electromagnets