THE COMMERCIAL ENIGMA: BEGINNINGS OF MACHINE CRYPTOGRAPHY

@article{Kruh2002THECE,
  title={THE COMMERCIAL ENIGMA: BEGINNINGS OF MACHINE CRYPTOGRAPHY},
  author={Louis Kruh and Cipher A. Deavours},
  journal={Cryptologia},
  year={2002},
  volume={26},
  pages={1 - 16}
}
A brief history and description of the first four models of the Enigma cipher machine, designed for the commercial market, taken in part from the authors' book [1]. 

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Figure 8. I (above) Model D and II (below) Model D with lid removed
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