In 2006, an antitrust lawsuit was filed in California against CRH subsidiary Oldcastle Precast and three AT&T affiliates. The defendants were alleged to have unreasonably restrained trade and conspired to monopolize telephone vaults for land-line connections. Plaintiffs challenged a contract requiring developers to purchase Oldcastle Precast product for properties served by AT&T infrastructure. They contended the arrangement led to Oldcastle Precast capturing northern California sales of precast electrical vaults, which were often placed concurrently with telephone structures. In 2010, an American Court of Appeal ruled that the plaintiff's counsel had failed to provide enough evidence to show that the defendants harmed competition in California and Nevada telephone vault markets.