The TypeX was an electromechanical cipher machine used by the British during WWII. It was devloped by Wing Commander O.G.W. Lywood, with the first production batch delivered to the RAF in 1937. As a British variant of the Enigma, versions of it came out to be more compatible for use in decrypting messages encrypted by the German's Enigma.
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O.G.W. Lywood, “TypeX,” Ciphers and Encryption, accessed September 26, 2021, https://crypto.omeka.net/items/show/17.