In an unprecedented move, a Delhi court on Tuesday summoned Bharti Airtel chairman Sunil Bharti Mittal, Essar Group promoter Ravi Ruia, and Asim Ghosh, former CEO of Vodafone Essar, in a case relating to allocation of additional spectrum dating back to 2001-2002. The court's order names them as accused in the case though the CBI had only named telecom firms Bharti Cellular, Hutchison Max Telecom and Sterling Cellular and not their bosses. Mittal, Ruia and Ghosh have to appear before the court on April 11.