or "factory" team (i.e. the official team of the company producing the cars, as opposed to a customer team which buys them off the shelf) therefore applied to chassis in the same way as it does in rallying and sports car racing. There have been some recent exceptions where a specialist company, not itself entered in the championship, has been commissioned to design and build a chassis for a team; Lola built cars for Larrousse and Scuderia Italia in the late 1980s and early 1990s, for example. Larousse had their points from the season erased after the FIA decided that they had falsely nominated themselves and not Lola as the chassis constructor. In , the new Arrows team which had been established by former Shadow personnel was sued by Shadow on the grounds that the Arrows FA/1 car was a copy of Shadow's DN9 – a view upheld by the UK High Court, which placed a ban on Arrows racing the FA/1. There have been more recent cases with Ligier (1995), Sauber (2004), Scuderia Toro Rosso (2006–2007) and Super Aguri (2007–2008) where teams have been accused of using a chassis produced by another constructor (respectively Benetton, Ferrari, Red Bull Racing and Honda). No action was taken against any of these teams, the sporting authorities being satisfied in each case that the team owned the intellectual property to the chassis they raced. From the middle of the season until the end of the season, each team had permanent racing numbers from race to race throughout the season. Between and the numbers were based on the teams' finishing positions in the 1973 Constructors' Championship (with slight modifications, e.g. Ferrari's traditional numbers were 11–12 until and 27–28 from onwards) and each team only changed numbers if they had the driver who had won the World Drivers' Championship in the previous season – the winning driver taking the number 1 and his teammate the number 2, and the team that had previously had those numbers switching to the newly-vacated ones. Between and the numbers were based on the teams' finishing positions in the Constructors' Championship from the previous season, with numbers 1 and 2 assigned to the defending champion and his teammate. During the period of 1974–1995 Tyrrell was the only team to keep the same numbers (3 and 4) every season. Since , racing numbers have been assigned to drivers instead of teams.