Incorporated in 1795, Plymouth is known for its industrialists and innovations. A. Terry & Company was a pioneer in the industry of malleable iron, and Eli Terry was instrumental in the creation of interchangeable parts leading to mass production. Cooper Oven Thermometer designed and created the first baking thermometers in the United States. Plymouth is also home to two sections of historic importance listed on the National Register of Historic Places: Plymouth Center, known as the initial center of town with locations on the Underground Railroad, and East Church, where a small group of Tories lived during the Revolutionary War.