| http://www.w3.org/ns/prov#value | - Examples of the types of tablet which may be used can be found in U.S. Pat. Nos. 3,959,585, issued to Mattes et al on May 25, 1976 and entitled Graphical Input Terminal, and 4,129,747, issued to William Pepper Jr. on Dec. 12, 1978 and entitled Human-Machine Interface Apparatus".
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