The popular cherry and melon symbols derive from this machine. The BAR symbol now common in slot machines was derived from an early logo of the Bell-Fruit Gum Company. The payment of food prizes was a commonly used technique. 7 Early machines, including an 1899 "Liberty Bell are now part of the Nevada State Museum's Fey Collection. 8 Other early machines, such as the trade stimulator, gave out winnings in the form of fruit-flavoured chewing gums with pictures. If a player matches a combination according to the rules of the game, the slot machine credits the player cash or some other sort of value, such as extra games. There are many different kinds of gambling slot machines.