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The other carried the teleprinter equipment and two Tunny machines, one for sending and one for receiving.This truck also carried a device for punching tapes for auto transmission.A radio operator then transmitted the ciphertext in the form of Morse code.Morse code was not used with Tunny: the output of the Tunny machine, encrypted teleprinter code, went directly to air.Most Americans tried their best to allow their children to enjoy their youth while they were slowly prepared for the trials and tribulations of adulthood.Although child labor practices still existed, more and more states were passing restrictions against such exploitation.From 1941 Hitler and the German High Command relied increasingly on Tunny to protect their communications with Army Group commanders across Europe.Tunny messages sent by radio were first intercepted by the British in June 1941.
In the 19th century, the American world consisted of children and adults.After a year-long struggle with the new cipher, Bletchley Park first read current Tunny traffic in July 1942.Tunny decrypts contained intelligence that changed the course of the war in Europe, saving an incalculable number of lives.International teleprinter code assigns a pattern of five pulses and pauses to each character.Using the Bletchley convention of representing a pulse by a cross and no pulse by a dot, the letter C, for example, is •••. gave each link a piscine name: Berlin-Paris was Jellyfish, Berlin-Rome was Bream, Berlin-Copenhagen Turbot (see right-hand column).
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A later version, the SZ42A, was introduced in February 1943, followed by the SZ42B in June 1944.