| http://www.w3.org/ns/prov#value | - However, magnets, such as permanent magnets or electromagnets, can be set at positions where the inner and outer magnetic rings 841 and 842 face each other. [0136] In a case where the permanent magnets are used, wiring does not need to be installed as is the case with the present embodiment and, therefore, the construction can be simplified.
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