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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.

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.

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