| http://www.w3.org/ns/prov#value | - Description of the Prior Art Heretofore, as a system for detecting a present position of a moving body such as the moving vehicles 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 centering around the moving body, light-reflecting means for reflecting the light
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