In 1898 Fey built the Card Bell, the first three-reel slot machine with automatic cash payouts. The following year Fey built the 4-11-44 in his basement it proved so successful at a local saloon that he soon quit his job and opened a factory to produce more units.

The first slot machine was invented by Charles Fey of San Francisco, California, U.S in 1894. Slot machines are the most popular gambling method in casinos and make up about 70 percent of the US casino's income. In some countries where money gambling in casinos is illegal the slot machines can issue free prizes, coupons or vouchers. The machine pays the winning or issue a coupon that will entitle to collecting reward in cash or prizes. Slot machines include a currency detector that detects if coins and notes are real ones and what values they have. If same numbers or pictures line up the player will win their bet or multiplier of it. Display of a slot machine have a reels, which have symbols and when player go to play, build in random number generator generates result in different symbols. The game is popular in casinos as it is easy and hassle free way to gamble money.

A slot machine ( American English), called also fruit machine ( British English), the slots ( Canadian English), poker machine or 'pokies' (slang) ( Australian English and New Zealand English) or simply slot ( American English), is a casino gambling machine with set of numbers or pictures that after putting money in it and pressing button will randomly spin.

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