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The telegraph model was produced presumably since 1955 by the Glavuchtekhprom of the Ministry of Education of the RSFSR.
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The demo model of the telegraph allows receiving Morse code signals by connecting a telegraph key and a direct current source with a voltage of 4 volts.
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When the key is pressed, the circuit closes and an electromagnet is triggered pulling a lever, at the long end of which a pencil is fixed, which, depending on the duration of pressing the key, draws short or long strips on the paper tape.
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The belt is manually driven.
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