| http://www.w3.org/ns/prov#value | - The arrangement of the electrode brushes 16A and 16B is not limited to the arrangement illustrated in FIG. 8, and any other arrangements may be employed, so long as the respective sliding contact positions of the separate portions 16Aa, 16Ab, 16Ba, and 16Bb do not overlap each other on the contact electrode parts 23 a.
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