Coca-Cola patents its iconic contoured bottle, Al Capone leaves prison, Luke and Laura get married, Harry Potter makes his movie debut, and Prince William and Kate Middleton announce their engagement, all on this day.
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NASA
1973: NASA launches Skylab 4 with a crew of three astronauts from Cape Canaveral, Fla., for an 84-day mission. The mission was the last of three to the Skylab space station, which burned up upon re-entry of the Earth's atmosphere in 1979.