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→Medieval–1640: Algebra is not hardware |
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| 725
| Chinese inventor [[Liang Lingzan]] built the world's first fully mechanical clock; [[water clocks]], some of them extremely accurate, had been known for centuries previous to this. This was an important technological leap forward; the earliest true computers, made a thousand years later, used technology based on that of clocks. {{Citation needed|date=July 2008}}
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| ''c.'' 850
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