2011: Biggest retail chain in the world
7-Eleven's string of milestones have continued over the years.
In 1984, 7-Eleven was the first convenience store to offer ATM service.
In 2004, 7-Eleven was first to offer its own prepaid wireless phone program.
In 2011, 7-Eleven became the retailer with the most number of stores in the world when it crossed 40,000 outlets.
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Last updated February 25 2011: 4:51 PM ET
