| http://www.w3.org/ns/prov#value | - For example, concentric geometric figures other than rings, such as squares, triangles, hexagons and numerous variations thereof, are described in U.S. Pat. No. 3,513,320, issued to Weldon, on May 19, 1970, and entitled Article Identification System Detecting Plurality of Colors Disposed on an Article and U.S. Pat. No. 3,603,728, issued to Arimura, on Sep. 7, 1979, and entitled Position and Dir
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