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        English: Cascade of gas centrifuges used to produce enriched uranium. This photograph is of a the U.S. gas centrifuge plant in Piketon, Ohio from 1984.
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         - Source:  http://www.doedigitalarchive.doe.gov/ImageDetailView.cfm?ImageID=1000682&page=search&pageid=thumb
 
        
        
         
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          This image is a work of a  United States Department of Energy (or predecessor organization) employee, taken or made as part of that person's official duties. As a  work of the  U.S. federal government, the image is in the  public domain. 
           Please note that  national laboratories operate under varying licences and some are not free. Check  the site policies of any national lab before crediting it with this tag. 
            
           
            
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