That's a pretty widespread system. I even saw an antique one in a newsagent in Broken Hill (way outback Australia) a few years ago. They did a little demo for m

That's a pretty widespread system. I even saw an antique one in a newsagent in Broken Hill (way outback Australia) a few years ago. They did a little demo for me when I asked what it was, though obviously it was only a curio these days.