Grinding wheels factory was established by a chemist. Which?
At the beginning the production was based on a patented procedure for production of grinding wheels in mineral bond. This production was abandoned in 1958 when it was substituted by up to dated production programmes.
Today you can buy their 100 years old tools in eBay for 200€ or more.
Or as you can read in some forums nowadays, its what's known as a barbers hone.