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. From Bally’s Money Honey introducing coinless play to video slots lighting up casino floors, and now gaming on your smartphone, the evolution is wild