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Los chinos utilizaron el Ábaco,
artefacto mecánico conformado por un conjunto de
cuentas acomodadas en hileras, para contar y realizar
cálculos.
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.