Slots have come a long way since Charles Fey’s original three-reel machines....

https://www.oddee.com/7-surprising-inventions-that-turned-slot-machines-into-digital-games-79667/

Slots have come a long way since Charles Fey’s original three-reel machines. Remember Bally’s Money Honey? It introduced electromechanical magic and big payouts. Now, from video slots to playing on your phone, the evolution is wild