| http://www.w3.org/ns/prov#value | - nd a lower surfaces of the substrate; c) hot-pressing at least two layers of metal foil sandwiching at least one substrate in a form of board or sheet formed with said connection means for electrically connecting the upper and lower surfaces; and d) patterning said at least two layers of metal foil, wherein any one of said perforation step and the succeeding steps further includes a step of formin
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