| http://www.w3.org/ns/prov#value | - Generally, the invention may be used for any system of rotatable members, e.g., a system of rollers which includes one or more frictionally driven rollers having their operational surfaces in mutual nonslip engagement with one another, the rotations of which are produced by a primary driving element which may be a roller, a web or other suitable member in frictional driving relation to one of the
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