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What are the oldest fast food restaurants?

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10 Oldest Fast Food Chains in the World Jack in the Box. Year Founded: February 21, 1951. Dunkin' Donuts. Year Founded: 1948. In-N-Out Burger. Year Founded: October 22, 1948. Dairy Queen. Year Founded: June 22, 1940. McDonald's. Year Founded:. KFC. Year Founded: March 20, 1930. White Castle. Year Founded: September 13, 1921. A&W. Year Founded: June 20, 1919.
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