In January 2007, the EC imposed fines amounting to more than €750 million on European and Japanese companies, including Mitsubishi and Toshiba, for their participation in a cartel for gas insulated switchgear (an important component in electric substations). The EC found that the companies had entered into an unwritten understanding to develop a quota system and geographically divide markets. On 12 July 2011, the General Court upheld the finding that there was a cartel, but found that the EC had contravened the principle of equal treatment by using different reference years for the turnovers of the European companies and Toshiba/Mitsubishi. As such, it annulled the fines for Toshiba and Mitsubishi. The General Court also reduced the fine imposed on Fuji Group from €2.4 to €2.2 million, to take into account the fact that they had cooperated in the investigations.