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Comptometer
about 1884
Early adding machine
In 1884, Dorr E. Felt of Chicago invented a machine for adding numbers. This is his prototype, a wooden macaroni box that contained the levers and wheels for a five-column adding machine. Over the next few years, Felt transformed this rough model into a practical adding machine, which he dubbed the comptometer. It was the first successful key-driven adding machine, and around 1900 it joined the typewriter as standard American office equipment.
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