Casino history is easier to see in the objects people handled: marked cards,...

https://varimail.com/articles/why-reels-became-the-default-way-to-show-slot-outcomes/

Casino history is easier to see in the objects people handled: marked cards, roulette wheels, and slot reels. In 1895, San Francisco mechanic Charles Fey built the Liberty Bell, an early automatic slot machine with three reels