| 4 años, 7 meses |
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![]() | Fuente (s): David, Paul A. (May 1985). "Clio and the Economics of QWERTY". American Economic Review 75 (2): pp. 332-37. American Economic Association. http://www.utdallas.edu/~liebowit/knowledge_goods/david1985ae |
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Mecanismo del teclado QWERTY de Christopher Sholes |
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