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

https://blast-wiki.win/index.php/The_7_Big_Inventions_Behind_Modern_Slot_Games

Slots have come a long way since Charles Fey’s original three-reel machine. From Bally’s iconic Money Honey that introduced electromechanical magic to today’s video slots and smartphone games, the thrills moved off the casino floor to your fingertips