When I was young, maybe 10-12, a friends dad had one like that, if you just press one button, like 1 + 1, and pull the lever it is not a big deal, but if you push ALL of the 9's times ALL of the 9's it was not so easy to pull the that lever. I do not remember how many columns of buttons , maybe 10 or 12. I am thinking is may have been 12... $1,234,567,890.12 but that was a LONG time ago.