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Algo importante
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En Egipto 3000 a.C
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Metalurgia
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En Mesopotamia 2000 a.C
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Asla menor
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En Grecia 500 a.C
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Ruedas dentadas,máquinas hidráulicas
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Alcantarillado,calefacción... siglo 1
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en China
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En regiones romanas siglo 3
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