| http://www.w3.org/ns/prov#value | - . 1 is a perspective view of an energy storage flywheel device of the present invention.FIG. 2 is a perspective view of another energy storage flywheel device of the present invention including an insert that has a wedge-shaped cross-section.FIG. 3 is perspective view of another energy storage flywheel device of the present invention including interlocking features.FIG. 4 is a perspective view of
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