Casino history is hiding in familiar objects: playing cards, the logic of...

https://rapid-wiki.win/index.php/Coin-Operated_Slot_Machine_Cabinets:_What_Parts_Mattered_Most%3F

Casino history is hiding in familiar objects: playing cards, the logic of single-zero and double-zero roulette wheels, and the turning reels of a slot machine. In 1895, a San Francisco mechanic helped make that last device iconic.