Better techniques for keeping the records by hand along with specialized calculating device continued to be developed through the centuries.The first real calculating machine that could add and subtract was a mechanical calculator called Pascal's Adding Machine or Pascaline,invented by a French scientist Blaise Pascal in 1642.Pascal' Adding Machine consisted of a toothed wheels or gears with each wheel having digits 0 through 9 engraved on it.The addition or subtraction was performed by turning these wheels.
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