1. computers
We can trace back at least to the early 17th century when mathematicians such as Wilhelm Schickhard, Blaise Pascal, and Gottfried Leibnitz designed machines that could solve mathematical problems such as addition, subtraction, multiplication, and division. ... In 1623 Wilhelm Schickhard invented the calculating clock. ... It was then in the 1670's that Gottfried Melanie Kizziar Leibnitz attempted to multiply mechanically. ...
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