prov:value
| - magnitude potential is supplied to the electrode 22 array by a power supply such as, for example, one of the type illustrated and described in U.S. Pat. Nos. 6,562,137; 6,537,378; 6,423,142; 6,144,570; 5,978,244; 5,159,544; 4,745,520; 4,485,427;
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