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

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 machine. We’ll explore how Bally’s Money Honey revolutionized play with electromechanical cabinets and how video slots paved the way for today’s smartphone games