| http://www.w3.org/ns/prov#value | - Several embodiments of measuring 3,440,543 4/1969 28 340/347 devices which determine the distance between arbitrary points 3,342,935 9,1967 LelfeL-jw 178/ 19 on a surface such as a map, graph or photograph are illus- 3293651 12/1966 Gerber e 396/29 trated.
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