The 30-component Dow Jones Industrial Average has three phenomenal deals hiding in plain sight.On May 26, the iconic Dow Jones Industrial Average (^DJI 0.20%) celebrated its 128th "birthday." Since its introduction in 1896, it's undergone more than four dozen changes and transformed from a 12-stock index packed with industrial businesses to one that's now represented by 30 time-tested, diverse, multinational companies.In mid-May, the Dow Jones made history by closing above 40,000 for the first time in its s ...