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<svg xmlns="http://www.w3.org/2000/svg" width="20mm" height="15mm">
  <desc>Trimmer resistor symbol according to GOST 2.728-74.</desc>
  <g fill="white" stroke="black" stroke-width="1pt">
    <rect x="5mm" y="8mm" width="10mm" height="4mm" />
  </g>
  <g fill="none" stroke="black" stroke-width="1pt" >
    <line x1="0mm"  y1="10mm" x2="5mm"  y2="10mm" />
    <line x1="15mm" y1="10mm" x2="20mm" y2="10mm" />
    <line x1="10mm" y1="8mm"  x2="10mm" y2="4mm"  />
    <line x1="10mm" y1="6mm"  x2="20mm" y2="6mm"  />
  </g>
</svg>