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  • 18:32, 30 July 2007 Bjelkeman (talk | contribs) uploaded File:Rota sludge well drilling.PNG (Rota sludge well drilling. Drilling a 20 m well in Chinandega, Nicaragua, with the Rota-sludge method. Insert left: Rota-sludge drilling head. Insert right: Stones extracted with Rota-sludge.)