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In 2006 a fragment of a cogwheel was discovered in Olbia (Italy); the layer where the fragment was found has been dated to the second quarter of the 2nd century BCE (https://www.academia.edu/35795869/Un_frammento_del_Planetario_di_Archimede_da_Olbia, p. 1788). The striking characteristic of this cogwheel, however, is that its teeth are not triangular but ...


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