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WikiPedia: Máy_bơm http://www.enggcyclopedia.com/welcome-to-enggcyclo... http://books.google.com/books?id=7igDAAAAMBAJ&pg=P... http://www.pumpschool.com http://www.essex-family-history.co.uk/parishpump.h... https://commons.wikimedia.org/wiki/Category:Pumps?...