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These were cast iron slots and weighed over 100 pounds. More than 30,000 Operator Bell machines were made. 1915 - The period of cast iron slot machines concluded, when Mills brought in less expensive slot machines using wood. 1930s, - The Mills Novelty Co. had made numerous changes to its line of slot machines that transformed the industry. Re-designed a less noisy machine which is why the machines were known as the "silent bell". Mills Company introduced a double jackpot assuring players the chance to win more than once, one after the other. Mills developed more colorful machine designs with their own themes. 1931, saw the first design being a Lion Head, 1931 a War Eagle and 1933 a Castle Front. |
