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While the torch and oval did make its debut in 1947, the "Amoco" name didn't appear on the logo until 1956, when they took over the Pan-Am stations in The South.
During much of the 60's, the "American" name appeared on the original torch and oval logo as well as the current version in use at the time.
In 2002, Amoco merged with BP. The last Amoco stations became BP in 2008.