Yorkshire and the Humber
Stainless steel was invented in 1913 by Harry Brearley of Sheffield, working for Firth Brown Steels (now called Sheffield Forgemasters). SAE 304 stainless steel is the most common stainless steel today, invented by Dr William Herbert Hatfield FRS in 1924 at Firth-Vickers known as Staybrite 18/8, a chromium-nickel steel. Many Swiss watches were mostly made out of Staybrite.
Massillon, Ohio
Stanley Macomber designed the open-web steel joist in 1921 while working for Massillon's Central Steel Company. Macomber left Central Steel and founded the Massillon Steel Joist Co. in 1923. His open-web steel joist, patented in 1924, was known as the Massillon Steel Joist. Macomber's invention was a revolutionary assembly of steel joists with a top slab used to support of floors, ceilings and roofs. The basis of Macomber's steel joist design is still used today. Stanley Macomber was inducted into the Inventors Hall of Fame in 2011.