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By 1881 he was Chief Engineer of Mines , and by 1894 Inspector General of Mines , becoming Dean of the Ecole Nationale des Mines in 1901 , a post he held until 1907 .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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