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[[File:Cooke and Wheatstone electric telegraph.jpg|thumb]] | [[File:Cooke and Wheatstone electric telegraph.jpg|center|thumb]] | ||
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:''A [[Teleprinter exchange]] is the original form of data transmission, developed during the Second World War and used as a secure and reliable long distance communication.'' | :''A [[Teleprinter exchange]] is the original form of data transmission, developed during the Second World War and used as a secure and reliable long distance communication.'' |