| http://www.w3.org/ns/prov#value | - In an upper portion or reaction vessel 1 which is made of an electrically conductive material such as aluminum and having a surface subjected to anodized aluminum processing, and the interior of which is kept airtight, electrode body 70 is located to be moved vertically by lift mechanism 2 such as an air cylinder or a ball screw and connection rod 3.
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