| http://www.w3.org/ns/prov#value | - Referring first to FIGS. 1A and 1B, the first reference body 20, preferably formed of copper or other highly conductive material, such as aluminum, has first and second surfaces, 27 and 21, respectively, formed parallel to each other such that they define a gap 23 through which the line of travel 10 of the moving object 15 passes.
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