Cryptanalytic Equipment
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showing Copphead, Gypsy, Topaz, and the Copperhead tape checker, basement, Bldg. 4 Annex,25 May 1945, Naval Communications Annex, 3801 Nebraska Ave., Washington DC, Record Group 457, Box 584, National Archives II, College Park, Maryland
PHPSlideshow by greg lawler at
http://www.zinkwazi.com/wp/scripts/
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