| http://www.w3.org/ns/prov#value | - Alternatively, the invention may be characterized as a rotary magnet apparatus comprising a first magnet with a magnetic axis; a housing which holds the first magnet such that the first magnet can rotate about a rotational axis generally perpendicular to the magnetic axis, the housing including means for exerting a predetermined substantial drag on the first magnet such that rotation of said the m
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