This image was copied from wikipedia:en. The original description was:
w:en:SIGABA — scanned from Codes and Ciphers: An A to Z of Covert Communication from the Clay Tablet to the Microdot, Fred B. Wrixon, Prentice Hall, 1992 [1]; image credits labelled courtesy of w:en:NSA.
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This article or image contains materials that originally came from a National Security Agency (NSA) website or publication. It is believed that this information is not classified, and is in the public domain in the United States. See the privacy and security information.
<a href="/wiki/SIGABA" title="SIGABA">SIGABA</a> — scanned from Codes and Ciphers: An A to Z of Covert Communication from the Clay Tablet to the Microdot, Fred B. Wrixon, Prentice Hall, 1992 [http://www.organix.tv/external/raw/Cryptome031800/nsa-rowlett.htm]; image credits labelled cour
(<a href="/wiki/SIGABA" title="SIGABA">SIGABA</a> — scanned from Codes and Ciphers: An A to Z of Covert Communication from the Clay Tablet to the Microdot, Fred B. Wrixon, Prentice Hall, 1992 [http://www.organix.tv/external/raw/Cryptome031800/nsa-rowlett.htm]; image credits labelled cour)
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Transwiki approved by: w:en:User:Dmcdevit This image was copied from wikipedia:en. The original description was: w:en:SIGABA — scanned from Codes and Ciphers: An A to Z of Covert Communication from the Clay Tablet to the Microdot, Fred B.