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M-209 Converter Encryption Machine Technical Manual 1944 Revised Edition by War - Picture 1 of 1

M-209 Converter Encryption Machine Technical Manual 1944 Revised Edition by War Department (Paperback, 2012)

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Price:
AU $34.65
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The M-209's elegant design uses six adjustable key wheels or rotors to produce a reciprocal substitution - also known asa Beaufort cipher. It describes the operation and care of this fascinating device.