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En el año 3000 a.C se inventa el ábaco
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Servían para calcular
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Inventadas por William Oughtred
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Primera máquina capaz de sumar y restar
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Capaz de sumar, restar, dividir y de multiplicar
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Plan projects on a visual timeline
Map milestones, phases, deadlines, and key events in one place so the sequence is easier to see and share. Timetoast is a timeline maker for work, school, research, and stories.