Bingo started with paper cards, where players marked numbers by hand. With...

https://www.bookmark-belt.win/bingo-has-come-a-long-way-from-paper-cards-to-digital-play-in-90-ball-bingo

Bingo started with paper cards, where players marked numbers by hand. With digital play, auto-dabbers do the marking for you, making 90-ball games smoother and faster