| http://www.w3.org/ns/prov#value | - Such a multi-layer printed circuit board used in the fabrication of an electric circuitry is manufactured by impregnating mesh-like woven fabric sheet of glass fiber with an insulating material such as polyimide to afford an insulating sheet called a prepreg, then forming wiring patterns (circuit patterns) on the surface of the insulating sheet, using an electrically conductive material such as co
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