A vehicle-mounted meter system includes: an inputting and outputting circuit for data measured to show a condition of the vehicle, a control circuit for controlling the system as a whole and for procession of the data, a meter main body, and a control unit detachably attached to the meter main body....http://www.google.fr/patents/US7107130?utm_source=gb-gplus-shareBrevet US7107130 - Vehicle-mounted meter system
