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The abacus is invented in Babylonia 3000 BC. The abacus was like a ancient calculator.
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The Antikythera Device, a bronze mechanical lunar month calculator, is constructed in Greece 80 AD. This was a very impresive demonstration of technology by our early realatives.
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William Oughtred invents the slide rule. This first one was circular. The slide rule is one of the most important tools we have.
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Wilhelm Schickard designs the first known mechanical calculator, the "Calculating Clock" to multiply large numbers. Calculators are fery important.
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Phillip-Malthus Hahn builds and sells a small number of calculating machines which are accurate to 12 digits. With 12 digits the calculator is much more accurate.
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The third Earl of Stanhope invents a multiplying calculator. Multiplication is very important.
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The first mass-produced calculating machine, Thomas de Colmar's Arithmometer, is marketed and continues in use for many years. With mass-produced calculators everyone can have one.
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Scheutz invents the first printing calculator. Printing calculators are very important, for banking and accounting.
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Herman (CPL Irwin?) Goldstine invents flowcharts. Flow charts are very important.
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Douglas Engelbart receives a patent on the mouse pointing device for computers. The mouse is one of the most important computer devices.
