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The inventor of the program-controlled computer was KonradZuse, who built the first working computer in 1941 and later in 1955 the first computer based on magnetic storage.[11]
George Stibitz is internationally recognized as a father of the modern digital computer. While working at Bell Labs in November 1937, Stibitz invented and built a relay-based calculator he dubbed the "Model K" (for "kitchen table", on which he had assembled it), which was the first to use binary circuits to perform an arithmetic operation. Later models added greater sophistication including complex arithmetic and programmability.[12]