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

https://tiny-wiki.win/index.php/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.