Cards, roulette wheels, and slot reels carry casino history in their details....

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

Cards, roulette wheels, and slot reels carry casino history in their details. This article follows the trail to an 1895 San Francisco workshop and looks at how single-zero and double-zero wheels shaped the game, beyond the familiar table.