A lot of identifications contribute to the wide use of Printed Circuit Boards (PCBs), including electronic components, platforms for electronic parts, and electronic connection providers. According to the number of layers, PCBs can be classified into the following three categories: single, double and multilayer PCBs. Ordinarily, multilayer PCBs have 4 or 6 layers
and some complicated multilayer PCBs have more.munity.
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