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The children's telegraph apparatus has been produced since 1979 by several enterprises of the country (can be installed by logos). DTA is designed to study the telegraph alphabet by the method of self-listening and two-way communication between two devices at a distance of the applied three-wire line. There is information that similar children's telegraph devices have been produced since the beginning of the 60s (since 1962), but so far there is no visual confirmation of this.