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

https://casinocrowd.com/the-7-big-inventions-behind-modern-slot-games/

Slots have come a long way since Charles Fey’s simple three-reel machines. Remember Bally’s Money Honey? It kicked off electromechanical slots that changed the game forever. Now, from video screens to smartphone apps you can play anywhere