| http://www.w3.org/ns/prov#value | - Further, other concrete examples of electrodes as shown in FIG. 5 include, for example, as shown in FIGS. 11(A) to (G), electrodes in which an external anode is formed to be polygon such as square and octagon, circle, semi-circle, and oval; and as an internal cathode, a cathode head located in a central part of the cathode is formed to be polygon such as square and octagon, circle and the like.
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