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* EMAS [http://www.emas-international.de www.emas-international.de ]
* Baptist [http://www.geocities.com/h2oclubs www.geocities.com/h2oclubs ]
* Deepwell pumps [http://www.rwsn.org www.rwsn.orgch] [http://www.handpumps.org www.handpumps.org] [http://www.watsan.org www.watsan.org]
