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20 h 31 m, 18 mayo 1955 año - He also served as the director of the International Centre for Genetic Epistemology in Geneva from 1955 till 1980.
Añadido al timeline:
7 feb 2018
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Jean Piaget
fecha:
20 h 31 m, 18 mayo 1955 año
Ahora mismo
~ 69 years ago
