| http://www.w3.org/ns/prov#value | - In the embodiments of FIGS. 36 and 37, the respective electrodes are shown to be flat, but it is preferable to employ such arrangement as has been referred to with reference to FIG. 13, 14 or 16 so that the active and counter electrodes 12 and 13 are provided as made uneven as shown in FIG. 38.
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