Revision history of "File:Rota sludge well drilling.PNG"

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  • (cur | prev) 18:32, 30 July 2007‎ Bjelkeman (talk | contribs)‎ . . (191 bytes) (+191)‎ . . (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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