Children's telegraph apparatus.

Everything else not included in the sectionsGames for children and adultsThe children's telegraph device has been produced since 1979 by several enterprises in the country (you can install it by logos). DTA is designed to study the telegraph alphabet by the method of self-monitoring and two-way communication between two devices at a distance of the applied three-wire line. 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.