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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.
well-drilling data processors used for providing computer read-out information indicative of parameters useful when drilling oil and gas wells-namely, time, depth, rate of penetration, hook load, bit weight, pump pressure, pump strokes, rotary rpm, rotary torque, mud volume, mud volume deviation, flow line rate, gas presence, and the like