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