I remember as a child in the fifties going to the shoe shop and viewing how well my shoes fitted with a Pedoscope ( apparently known as a Fluroscope in USA). This was an x-ray machine, you stood with your feet in it and looked through the viewer in the top. I attach a picture.
I loved using it, could see shoe and foot outline and all the bones, if I remember correctly. My mother discouraged me from using it, there were concerns about safety. Apparently they started being used in the 1920’s and in UK began to be removed from late 1950’s through to 1960’s. I cannot recall using one from 1963 onwards. Not sure if they were banned,consumers stopped using them or owners were concerned about their own safety and their staff safety.