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        Electronic Office | History of the Computer

        February 1954: Dr Pinkerton, an electrical engineer at J Lyons & Co. Ltd., Cadby Hall carries out his job with the aid of 'Leo', the world's first all-purpose commercial electronic high-speed calculator. 'Leo' was developed by the firm's own electronics department, after six years of research. (Photo by John Pratt/Keystone Features/Getty Images)

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