| http://www.w3.org/ns/prov#value | - The black oxide layer 140 is applied to the metal of the heat spreader 110 so as to improve the junction between a pre-preg, which is a material for the junction of the printed circuit board 200 and the heat spreader 110, and the surface of the contact metal, which is formed of such material as copper or nickel, of the heat spreader 110.
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