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Aqui aparece uno de los primeros aparatos que permitio a los humanos hacer calculos (computar datos)
Mas informacion: http://www.cavsi.com/preguntasrespuestas/cual-es-el-origen-y-la-historia-del-abaco/ -
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A list shows items. A timeline shows sequence.
Use Timetoast to make dates, milestones, and turning points easier to understand in a clear visual format. Timetoast is a timeline maker for work, school, research, and stories.