| http://www.w3.org/ns/prov#value | - a pair of spaced planar substrates defining between them a flow path between a sample inlet and an outlet; an ion filter disposed in the path, further including at least a pair of spaced electrodes, the filter comprising at least one of the electrodes on each substrate opposite each other; an electrical controller for applying voltages, including an asymmetric periodic voltage applied to the filte
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