| http://www.w3.org/ns/prov#value | - Finally, according to the fourth aspect of the present invention, a fan unit including at least a fan and drive means therefor is arranged apart from the vehicle body with the suction port of the fan held in fluid communication with the top opening of the vehicle body by means of a flexible, extensible air duct so that the vehicle itself is further reduced in weight and can be utilized as a vacuum
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