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  • Given That We Can Only Employ Plated Through Holes (PTH) and Not Blind Vias on Four-Layer Circuit Boards, How Do We Achieve Interconnection Between the Mid Layers?

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Given That We Can Only Employ Plated Through Holes (PTH) and Not Blind Vias on Four-Layer Circuit Boards, How Do We Achieve Interconnection Between the Mid Layers?

Adding copper connections to the PTHs in both inner and outer layers will allow the PTHs to connect the different layers of the board.