| http://www.w3.org/ns/prov#value | - Representative examples of the apparatus and method are described in several U.S. patents: U.S. Pat. No. 3,011,877, Schweickert et al., issued Dec. 5, 1961; U.S. Pat. No. 3,099,534, Schweickert et al., issued Jul. 30, 1963; U.S. Pat. No. 3,147,141, Ishizuka, issued Sep. 1, 1964; U.S. Pat. No. 4,150,168, Yatsurugi et al., issued Apr. 17, 1979; U.S. Pat. No. 4,179,530, Koppl et al., issued Dec. 18,
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