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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.
controls for the track feeding of small parts in automatic assembly equipment, and parts thereof-namely, for detector, actuated photoelectrically, for sensing the presence of objects by direct or reflected light causing the actuation of a relay preselected to respond to the absence or presence of such object, and parts thereof; capacitance variance detector unit and relay control circuit designed to produce an electrical signal responsive to the position or absence of a part; and an air flow detector unit, comprising a pneumatic snap action control switch designed to produce an electric signal when an object interrupts the flow of air across an opening, and parts thereof