| http://www.w3.org/ns/prov#value | - ollector material is subject to the perforating process, such as an etching, in order that the penetration direction of the through-hole is anisotropic to make the sections of the through-holes vertically straight.On the other hand, when the perforating process such as an etching is performed to form the through-holes 20a and 23a without becoming conscious of the anisotropy, the through-holes 20a
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