Abstract
The Austrian engineer Curt Herzstark invented the world-renowned mechanical pocket calculator Curta. The books and the papers on the history of computing mention two models, Curta 1 and Curta 2. In November 2015 original drawings and patent documents on a multiple Curta were discovered in Switzerland. This device is supposed to be the world’s smallest mechanical parallel calculator.
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Bruderer, H. (2016). The world’s smallest mechanical parallel calculator: Discovery of original drawings and patent documents from the 1950s in Switzerland. In IFIP Advances in Information and Communication Technology (Vol. 491, pp. 186–192). Springer New York LLC. https://doi.org/10.1007/978-3-319-49463-0_13
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