A system and method for a certificate verifier to make a request to a certificate distribution server for a copy of another entity’s digital certificate and to have the certificate distribution center validate it. A rotation allowing mechanism is provided on at least one of the fixed parts in order to allow the bar body to rotate with respect to the vehicle body. The imaging element includes a light receiving face arranged to receive light passing through the lens unit, and converts an optical image of the subject into an electrical signal. A cover is coupled to the base to be movable in the predetermined direction. The wiper element is made of a flexible, resilient material and substantially centered over the opening in the seat.