Back in the 1970's I spent many hours and money playing Bingo machines, in our area they were known as Money Machines. They were often found in back rooms of barber shops, Snooker Rooms. They were a gambling device.
Nowadays they are deemed as being boring to play but understanding how they work and how to play them, I find them quite enjoyable to play. People are often confused about these machines and think they're pinball machines too.