| http://www.w3.org/ns/prov#value | - Preferably, the matching surface 986 is formed in an inert portion of the pumping or mixing element 980, such as the matrix material (e.g., plastic, metal, composites, etc.) used to support the levitation magnet or magnet array 988 (which is shown schematically, but could be any appropriate one of the arrangements described herein).
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