Charles Augustus Fey invented the first slot machine which allowed automatic payouts in 1891. He reduced the complexity of reading a win, by replacing the 5 reels with just 3 and the 50 different playing cards with just 5 symbols – hearts, diamonds, spades, horseshoes, and a liberty bell. The highest payout was awarded for 3 bell symbols since the machine was named Liberty Bell. Since then, slot machines pay customers on the original logic, no matter how complex they have been evolved since!