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Page history
15 October 2012
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→External links
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27 July 2012
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16 February 2012
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7 September 2011
26 August 2011
Added RWSN diagrams
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added info from RWSN field note and restructured to be consistent with Treadle pump page
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→External links: added relevant RWSN field note
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6 September 2010
26 May 2010
13 January 2010
11 August 2009
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