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<p>drilled holes that enable electrical interconnections between conductive layers, to boards with more than a single side. Printed circuit boards are used in nearly all electronic products today. Alternatives to PCBs include <a href="page.php?w=wire_wrap">wire wrap</a> and <a href="page.php?w=point-to-point_construction">point-to-point construction</a>, both once popular but now rarely used. PCBs require additional design effort to lay out the circuit, but manufacturing and assembly can be automated. <a href="page.php?w=Electronic_design_automation">Electronic design automation</a></p><p>
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