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Wing tip turbine

http://www.freepatentsonline.com/4917332.html
http://www.aiaa.org/content.cfm?pageid=406&gTable=mtgpaper&gID=80452

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>Wing tip turbine

>http://www.freepatentsonline.com/4917332.html
http://www.aiaa.org/content.cfm?pageid=406&gTable=mtgpaper&gID=80452