The reason was a cipher machine known as the telecipher.
Source: wiktionary
Telecipher
Synonyms for "telecipher"
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In addition to the Enigma ciphers, a number of other telecipher machines were used for high-level communication.
Source: wiktionary
Initially, the attention was focused on the development of a telecipher machine in collaboration with Gretener.
Source: wiktionary
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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.