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History of Computers
History of Computers
30,000 BC to 20,000 BC Carving notches into bones
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1900 BC to 1800 BC The first place-value number system
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1000 BC to 500 BC The invention of the abacus
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383 BC to 322 BC Aristotle and the Tree of Porphyry
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300 BC to 600 AD The first use of zero and negative numbers
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1274 AD Ramon Lull's Ars Magna
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1285 AD to 1349 AD William of Ockham's logical transformations
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1874 AD The Sholes (QWERTY) Keyboard
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1878 AD The First True Incandescent Light Bulb
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1879 AD Robert Harley publishes article on the Stanhope Demonstrator
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1880 AD The invention of the Baudot Code
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1881 AD Allan Marquand invents the Marquand Logic Machine
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1883 AD Thomas Alva Edison discovers the Edison Effect
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1886 AD Charles Pierce links Boolean algebra to circuits based on switches
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1890 AD Herman Hollerith's Tabulating Machines
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