| http://www.w3.org/ns/prov#value | - The invention also provides apparatus for identifying the position in three dimensions of a movable object, e.g. such as a sensor or a tool carried by a robot, the apparatus being characterized in that it comprises a photosensitive detector such as a video camera, e.g. of the CCD type, carried by the movable object and capable of being swivelled on said object about at least one axis, means for de
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