| http://www.w3.org/ns/prov#value | - The apparatus comprises a toothed belt supported on spoke-surfaced pulleys, the pulleys rotatably supported on parallel spaced apart plates, one of the plates having a smooth bottom edge and extending further below the axis of the pulleys than the bottom edge of the other plate and acts as a guide and support; one pulley is attached to a drive motor and the belt is sufficiently loose on one side o
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