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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).
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DTA is designed to study the telegraphic alphabet by the method of self-listening and two-way communication between two devices at a distance of the applied three-wire line.
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There is information that such 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.
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