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The first phones were single units, consisting of an ear-piece which was used alternately for speaking and listening. With the construction of the first telephone exchanges, telephones got a separate microphone device for speaking into. About 1890, the microphone and earpiece were combined in a single unit. The Ericophone of 1954, "The Cobra" was a completely new design with earpiece, microphone and dial in a single unit. Great for receiving and delivering the latest news!