| http://www.w3.org/ns/prov#value | - Above and other objects and features of the invention will become apparent from the detailed description with reference to the drawings, in which: FIG. 1 is a section of a conventional rotary grinding wheel for illustrating the abrasion of the .periphery with use together with improper paths in a workpiece followed by the grinding wheel; FIG. 2 is a section of part of the rotary grinding wheel acc
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