| http://www.w3.org/ns/prov#value | - th the pole faces of the permanent magnets in the rim; said electromagnet having first and second pole faces and having a continuous core of magnetic material extending from said first pole face on one side of said wheel to said second pole face on the other side of said wheel; and said electromagnet including at least one coil extending around said core of magnetic material; a battery; circuitry
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