| 摘要 |
A circuit is printed on a circuit board material, which does not have a copper foil layer and does have a paper base material is impregnated with a resin, using an electroconductive coating material. The board material preferably is a paper phenol board material, wherein the paper base material is impregnated with phenol resin, on which a resist layer is formed and a circuit is printed on the resist layer using an electroconductive coating material.
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