The electronics division of the Atomic Energy Research Establishment at Harwell, UK built the Harwell Dekatron Computer in 1951, which was an automatic calculator where the decimal arithmetic and memory were electronic, although other functions were performed by relays. E. H. Cooke-Yarborough based the design around a 64-kilobyte magnetic drum memory store with multiple moving heads that had been designed at the National Physical Laboratory, UK. From August 1956 CADET was offering a regular computing service, during which it often executed continuous computing runs of 80 hours or more.
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