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<p>design, a via consists of two pads in corresponding positions on different copper layers of the board, that are electrically connected by a hole through the board. The hole is made conductive by <a href="page.php?w=electroplating">electroplating</a>, or is lined with a tube or a <a href="page.php?w=rivet">rivet</a>. High-density multilayer PCBs may have <a href="page.php?w=microvia">microvia</a>s: <b>blind vias</b> are exposed only on one side of the board, while <b>buried vias</b> connect internal layers without being exposed on either surface.</p><p>
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