Simplified scheme of a telegraphic installation.
<ol><li>transmitting station</li>
<li>receiving station</li>
<li>manipulator</li>
<li>battery</li>
<li>ground</li>
<li>wire</li>
<li>electromagnet</li>
<li>indentor (indenter)</li>
<li>paper roll</li>
<li>platen</li>
<li>draw rollers</li>
<li>paper strip</li></ol>
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