| http://www.w3.org/ns/prov#value | - Now components of the present invention will be described below with reference to FIG. 2. (Recess 21) The metallic mounting substrate 22 that has the recess having such a shape as becoming wider toward the mouth and the projection formed on the opposite side of the recess may be made of almost any metal such as copper, copper-containing iron, copper-containing tin, aluminum and aluminum alloy.
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