Enigma machine
In December 1932, the Cipher Bureau's mathematician-cryptologist Marian Rejewski reconstructed the wiring of the German Enigma machine. The Poles' subsequent reading of German ciphers laid the foundation for the western Allies' Ultra cipher-breaking operations, beginning seven years later, during World War II. Now, in January 1933, just as Hitler was coming to power in Germany, AVA quickly produced a "double" of the Enigma machine; by mid-1934, it had made over a dozen.