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REMOTE-CONTROLLED ELECTRIC TRACTORS ADAPTED FOR CARRYING CAMERAS, CAMERA CABLES AND CAMERA LIGHTS THROUGH CONDUITS; TELEVISION CAMERAS, NAMELY, MINIATURE TELEVISION CAMERAS FOR USE IN PIPELINES AND TUNNEL SURVEYS, IN CONDUIT AND SEWER INSPECTIONS, AND IN SURVEILLANCE OPERATIONS; CLOSED CIRCUIT TELEVISION SYSTEMS, NAMELY, MONITORS, CONTROL UNITS AND CABLES; AND PARTS THEREFOR