The Tour du Lay grinder, also called the Bois-Brûlé grinder, is a grinder in Nesles-la-Vallée, in the departmental forest of the Tour du Lay in the Val-d'Oise department. The grinder was discovered in 1969 by the Archaeological Study and Research Group of Val-d'Oise. It was classified as a historical monument on 23 June 1976.
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Source: Romain Pajda
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