Structure: R.F. Graf HouseLocation: Knoxville, TennesseeArchitect: Herbert GrafDate: 1923Tidbit: In the early 1900s, Knoxville had an architectural firm called R.F. Graf & Sons, a firm comprised of architect R.F. Graf working alongside his architect sons (a family business, you know?). At some point, one of the sons (Herbert) left the firm to