| http://www.w3.org/ns/prov#value | - Further, the present invention is characterized by including means for predicting an azimuth on the basis of the azimuths of the detected retroreflective means in which azimuth the retroreflective means is to be detected in the next scan, and means for setting the included angle formed by adjoining two of the straight lines which connect each turn center in a previously established traveling cours
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