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Puits Hély d’Oissel
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The 455 m depth shaft was sinked in Gréasque in 1912 by the « Société Nouvelle des Charbonnages des Bouches-du-Rhône », under direction of the engineer Hély d’Oissel.
The metal headframe was builded en 1917 by Derobert. The place was in activity from 1922 to 1962, and is now classified as historical monument and is occupied by a museum of the mine.
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