Stefan Mayer

Stefan Mayer Colonel Stefan A. Mayer (1895 — 23 March 1981, London) was a Polish military intelligence officer and prewar chief of Counterintelligence within the Polish General Staff's Section II (''Oddział II''). In that capacity, he supervised the General Staff's Cipher Bureau, whose achievements included the breaking of German Enigma-machine ciphers. Provided by Wikipedia
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