The Curta was the first computational precision machine that could be held in one hand and was engineering, not online. Could add, to subtract, to multiply, divide and extracting square and cubic roots. The inventor of, the Curt Herzstark, completed the design during his confinement at the Buchenwald concentration camp, During World War II. The Curta was used widely by scientists, engineers, surveyors and accountants during the 1950s and 1960s, to put aside only after the appearance on the market of electronic pocket calculators, 1970