| http://www.w3.org/ns/prov#value | - FIG. 1 shows one form of the apparatus that may be used in accordance with the present invention. full particulars of the basic apparatus of which this apparatus is a specific form including methods of varying rotation, etc. are described in U.S. Pat. No. 2,862,251, issued Dec. 2, 1958, and are incorporated in the present application by reference and need not be described in complete detail here.
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