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Jake French Blaise Pascal invented the caculator
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around 2000 BC, the mechanical calculator, developed in the 17th century.
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In 1671 an improved mechanism for performing multiplication by the process of repeated addition was designed by Gottfried W. von Leibniz.
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In the 1960's it became avaible in a pocket size
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The first desktop programmable calculators were produced in the mid-1960s by Mathatronics and Casio
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They became popular in the mid-1970s as circuits made their size and cost small
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in 1877 the mechanical caculator was introduced
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