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The LEO I computer, at the Cadby Hall premises of J Lyons & Co. Ltd. in London. The cabinets of the LEO central processor are in the background to the right of the photo, with the mercury delay line storage units beneath the cabinets under the raised floor. Only one LEO I computer was built. It first worked in 1951 and was a greatly-enlarged version of the Cambridge EDSAC.





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