| 摘要 |
According to the present invention, on a double-sided substrate 1, a plurality of through-holes 2 connected to one wire 6 for plating as well as wiring are collectively arranged within a narrow range close to the connection portion. After a plating process, a penetrating hole 12 is formed and the connection potion is cut off. Thus, the wire 6 for plating and the collectively arranged through-holes 2 are made independent of one another so that no electric conduction occurs among the wire 6 for plating and the through-holes 2.
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