There is a Robertson historical plaque on the windy part of bronte rd n. Until I saw that I didnt realize Robertson was connected to milton.Friends of mine now own PL Robertsons mansion , which was built here in Milton where he lived. His 'missed opportunity" was henry ford wanted the screw for his automobile assembly line, it didnt fall off the screwdriver. Robertson balked when Ford demanded an equity position in the company and a guy named Philips became rich and the maker of all automotive hardware for the next 90yrs. Robertson still made bags of cash, but you couldn't find a square drive screw in the US for years.