Assertion: racing's race | /r/HasProperty | contested by aston martin dbr1
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text: In the 1950s, sports car racing was regarded as almost as important as Grand Prix competition, with major marques like Ferrari, Maserati, Jaguar and Aston Martin investing much effort in their works programmes and supplying cars to customers; sports racers lost their close relationship to road-going sports cars in the 1950s and the major races were contested by dedicated competition cars such as the Jaguar C and D types, the Mercedes 300SLR, Maserati 300S, Aston Martin DBR1 and assorted Ferraris including the first Testa Rossas.