It is proposed to assign a mounting arm to a toll calculator which is embodied as a surface-mounted device and which is connected in an articulated fashion to the toll calculator and can be mounted on the windshield of the motor vehicle. The toll calculator itself then rests with a relatively small area...http://www.google.co.uk/patents/US7084784?utm_source=gb-gplus-sharePatent US7084784 - Means of mounting a toll calculator in a motor vehicle
