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system with clay characters is developed in China by Bi Sheng.
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developed in China by Shen Kua a scientist
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are produced in Korea.
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Johann Gutenberg , Invented the movable metal-type printing process in 1450
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Early 1600s, William Oughtred, an English clergyman, invented the slide rule
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invented by Galeleo
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developed by John Napier (Scotland) making multiplying easier and this is still the foundation much of the scientific and technical communicate based their calculations on.
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assembled by Stephen Daye (a locksmith) and his son Matthew in Cambridge, MA.
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developed by Blaise Pascal
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developed by James Watt
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thomas edison
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