UPDATE 2-Transocean says may face $473 mln U.S. tax bill
February 29, 2012 at 19:45 PM EST
Feb 29 (Reuters) - Transocean Ltd may face $473 million in U.S. back taxes, according to its annual filing, though it also said it was cleared in a similar dispute dating back eight years, which may give its lawyers a useful precedent.
