sentences:  ACS patented the invention and sold models to several local schools.The original structures are still in use in the third grade classroom in 2014.The Avery Coonley School was designated a historical site by the Downers Grove Historical Society in 2006, and was added to the National Register of Historic Places in 2007, which cited the educational program along with the building and grounds for their "unique design and features that have exerted a long-lasting influence on schools throughout the country".