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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.
instruments for sensing hazardous gases, instruments for monitoring hazardous environments, and devices for providing communications to and from hazardous environments, namely, instruments to be placed through a hole to assess an enclosed environment, instruments to be placed in an enclosed location to monitor the environment in the enclosed location, instruments to be lowered into or through an opening to assess the environment therein, instruments to facilitate communication between an enclosed location and an exterior location, sensor calibration apparatuses, and local and remote displays of gas levels