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Archimedes screw

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Acknowledgements
==Acknowledgements==
* [http://www.waterencyclopedia.com/Po-Re/Pumps-Traditional.html#b Pumps, traditional]. Waterencyclopedia.com.
* Dr. Sataa Al-Bayati, [http://uotechnology.edu.iq/dep-building/LECTURE/sanitary%20&%20environmental/third_class/Water%20Networks%20and%20Equipment/D-pumps-3rd%20Class.pdf Pumps and Pumping Stations, 3rd Class.] University of Technology - Iraq.
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