| http://www.w3.org/ns/prov#value | - Although the metal board of the solid printed substrate of the present invention is generally 0.05 to 2.0 mm in thickness, preferably a board made of aluminum, copper alloy such as nickel silver or brass, copper, copper clad invar, stainless steel, iron, silicon steel and aluminum processed by electrolytic oxidation or the like, each being 0.1 to 1.5 mm thick, can be used.
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