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- Al Jazari wrote the Book of Knowledge of Ingenious Mechanical Devices in 1206, where he described fifty mechanical devices along with instructions on how to construct them. http://en.wikipedia.org/wiki/al-jazari 14 comments history
- Al-Jazari - the Arab Scholar who invented the crankshaft, piston engine, valve, cam, mechanical clock, combination lock, programmable and humanoid robot. Funny we always think Da Vinci was so smart. http://en.wikipedia.org/wiki/al-jazari 94 comments reddit.com
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