| http://www.w3.org/ns/prov#value | - The magnet is preferably configured to be replaceable, removable, or both.The above features and advantages, and other features and advantages of the present invention are readily apparent from the following detailed description of the best modes for carrying out the invention when taken in connection with theaccompanying drawings.BRIEF DESCRIPTION OF THE DRAWINGSFIG. 1 is a schematic diagram of a
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