When the Swiss discovered that their Enigma traffic was being intercepted by both the Germans and the French, their they developed their own electromechanical wheel-based cipher machine known as the NEMA (Neue Machine). Between 1941-43, a team of mathematicians including Hugo Hadwiger, Heinrick Emil Weber, Paul Glu, and Captain Arthur Alder worked to develop the machine, with the first prototype being developed in 1944, and production starting in 1946, too late to assist the war efforts.
A total of 640 machines were built by the manufacturer, with numbers TD-100 to TD-199 being issued for use by the Foreign office, numbers TD-200 to TD-419 being used in training, and numbers TD-420 to TD-740 being Operational Machines reserved for use in war. The Operational Machines were slightly different in operation, with different notches on the stepping wheels, two extra wheels stored in the lid, and a paper label on the lid in French, German, and Italian indicating that they were only to be used in the event of war. The Swiss Army used the NEMA after WWII until it was replaced by other more advanced cipher machines, such as the Hagelin. The NEMA was officially declassified on July 9th, 1992.
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