| http://www.w3.org/ns/prov#value | - However, additional first electrodes 232 could be added (e.g., electrodes 232-4, 232-5, etc.) such that N1>N2. [0071] Electrodes 232 are preferably lengths of tungsten wire, whereas the hollow elongated ???U???-shaped electrodes 242 are formed from sheet metal, preferably stainless steel, although brass or other sheet metal could be used.
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