| http://www.w3.org/ns/prov#value | - ral surface, said drive pin being located at a position other than the center of said rotation plate; and said drive pin being positioned within said concave recess with said rounded arcuate peripheral surface in contact with both of said axially extending, circumferentially spaced surfaces, such that said eccentric rotation of said rotation plate will cause eccentric rotation of said drive pin, a
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