Water Tower, Chesterfield

This water tower was part of a factory producing pill boxes of various types for over 100 years.  Robinson's Mill is now flats, but the tower remains.

The mill was also connected to the same railway line that served the gas works and brewery. My earlier Blip was Chains

As well as producing pill boxes and medical dressings, what I also found out was Robinson's had patented the first sanitary towel in the 1880s, and also produced the tubes for Smarties. Which is the most surprising?