| http://www.w3.org/ns/prov#value | - Heretofore, as a system for detecting a current position of a moving body such as the moving vehicles as described above, there has been proposed a system provided with a means for scanning a light beam emitted from a moving body in the circumferential direction or every azimuthal direction around the moving body, retroreflective means for reflecting the light beam in the direction of incident lig
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