| http://www.w3.org/ns/prov#value | - An island-shaped holding plate 53 is also formed on the supporting frame 48, the edge 54 of which holding plate is equidistant from the edges 31, 33, 45, 52, this edge 54 also being separated from the edge 33 of the recess 32 in the lower plate 26 by a short distance a so that in this case there is an area not covered by a part of the workpiece holder 20 so that in this area a continuous closed se
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