Chiffriermaschinen AG began advertising a rotor machine, Enigma model A, which was exhibited at the Congress of the International Postal Union in 1924.
Chiffriermaschinen AG filloi reklamimin e një makinerie me helika -Modeli Enigma A-, e cila u shfaq në Kongresin e Bashkimit Postar Postar në vitin 1924.