Casino history lives in objects people handled: worn cards, roulette wheels...

https://mighty-wiki.win/index.php/Why_Reels_Became_the_Default_Way_to_Show_Slot_Outcomes

Casino history lives in objects people handled: worn cards, roulette wheels with single-zero or double-zero layouts, and turning slot reels. A Market Street workshop offers a glimpse of how gambling technology took shape in San Francisco.