I remember seeing and using the one from 1996 in my early childhood as displayed in this article: https://www.bbc.co.uk/news/business-32738088#_=_ https://www.

I remember seeing and using the one from 1996 in my early childhood as displayed in this article: https://www.bbc.co.uk/news/business-32738088#_=_ https://www.bbc.co.uk/news/business-32738088#_=_ Not sure if these actually used X-rays but it'd be interesting to find out if they did. EDIT: In hindsight, I really don't think the type I remember used X-rays. ANOTHER EDIT: Looks like this is the company that made the ones I can remember: http://sensatech.com/applications/index.html http://sensatech.com/applications/index.html