Inside an ATM, Photo: Science Channel
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An ATM is a wonderful machine. It consists of 400 parts. It has a smart card reader checks the balance and a set of high friction rollers that just picks one bill at a time. There is a sensor to spot if there is an extra bill picked by the roller. All the parts are kept in a 480 lb steel case. Here is a video from YouTube channel Science Channel that explains how an ATM works..
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: YouTube