This article has a historical nature. To keep and to build the experience in one or another field of knowledge is one of the key tasks today. Background knowledge is as necessary as useful, because it internally enriches people, gives them the possibility to gain an insight of the present and to plan the future. Historical analysis of any technical phenomenon feeds its methodological description, that is not only educational, but also formative for the youth.
telegraph, railway, safety protection, first underground cables, circuit of the first main telegraph communication line
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