In the early 1930s the Mills Novelty company made additional changes to their line of slot machines.

In 1915 the company then began manufacturing a less expensive version of the Operator Bell, replacing the heavy cast iron machines with ones made out of lighter wooden cabinets. Changes such as a gooseneck coin acceptor and fruit symbols to replace the traditional images became a standard for slot machines for decades to come, and over 30,000 of these machines were produced.

In 1910 the company introduced a slight variation of the Liberty Bell, called the Operator Bell. In 1907, with the growing popularity and demand for the Liberty Bell, the Mills Novelty Company began manufacturing the 'Mills Liberty Bell'. Popularity Liberty Bell Slot Machine memorial, San Francisco The payouts for the Liberty Bell were as follows: Three Liberty Bells offered the largest payout of fifty cents (10 nickels), which was ejected by the machine. If the same symbol appeared on all three reels a bell would ring and the player would be awarded with coins. Once the player deposited a nickel, he could pull the lever on the side of the machine and the reels would begin to spin, stopping on any random combination of symbols.

How it worked Įach of Liberty Bell's three reels were imprinted with a symbol of a diamond, heart, spade, horseshoe, star and a cracked Liberty Bell. An original Liberty Bell slot machine is currently on display at the Liberty Belle saloon in Reno, Nevada as a historic artifact. Created in 1894 by Charles Fey (1862–1944), a car mechanic from San Francisco, the Liberty Bell's popularity set the standard for the modern slot machine its three-reel model is still used today despite great advances in slot technology over the past several decades. The Liberty Bell was the first variation of the modern mechanical slot machine we see today, originally being referred to as a 'fruit machine' or 'one-armed bandit'.

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