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The origin of the calculator is attributed to the abacus, which was in use long before the use of written numeric systems. The abaci were constructed from a wooden frame with beads sliding on wires. This calculation device is still in use today by some merchants in China and elsewhere. A derivative of the abacus is Napier's bones, which is a complex solution extraction solution. Another interesting counting or memory aid was the Tally stick, with the oldest known device (Lebombo bone) dating ba read more...

Tags: china, keypad, science, designe

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