The first public actions in the United States to achieve ATM access for the blind occurred in June 1999. On June 3, Mellon Bank and PNC Bank were sued in federal courts in Philadelphia and Pittsburgh respectively. On June 25, 1999, Wells Fargo became the first major bank in the United States to commit to installing talking ATMs. In a legal settlement with blind community leaders, the bank agreed to install a talking ATM at all of its 1,500 ATM locations in California. The company has subsequently installed talking ATMs at all ATM locations in all states. In July 1999, Citibank agreed to pilot five talking ATMs in and around San Francisco and Los Angeles. The Citibank machine represented a unique engineering and research challenge as it uses a touch screen interface and has no function keys to offer access to the blind. All Citibank locations with this kind of machine have been adapted with talking functionality.