| http://www.w3.org/ns/prov#value | - aid element; (c) first magnetic field means for producing a varying magnetic field imparting a vibrational or rotational motion to said element, said means including at least one electromagnetic coil to be placed adjacent to the portion of the patient in which said element is disposed; (d) further magnetic iield means for producing one or more unidirectional magnetic biasing fields acting on said
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