While not a toy, in shoe stores they used to x-ray children's feet to measure them. https://en.wikipedia.org/wiki/Shoe-fitting_fluoroscope https://en.wikipedia.

While not a toy, in shoe stores they used to x-ray children's feet to measure them. https://en.wikipedia.org/wiki/Shoe-fitting_fluoroscope https://en.wikipedia.org/wiki/Shoe-fitting_fluoroscope